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Units & Measurements

275 Questions
All Exams JEE Mains JEE Advanced
2022 JEE Mains MCQ
JEE Main 2022 (Online) 30th June Morning Shift

If n main scale divisions coincide with (n + 1) vernier scale divisions. The least count of vernier callipers, when each centimetre on the main scale is divided into five equal parts, will be :

A.
${2 \over {n + 1}}$ mm
B.
${5 \over {n + 1}}$ mm
C.
${1 \over {2n}}$ mm
D.
${1 \over {5n}}$ mm
2022 JEE Mains MCQ
JEE Main 2022 (Online) 28th June Evening Shift

Velocity (v) and acceleration (a) in two systems of units 1 and 2 are related as ${v_2} = {n \over {{m^2}}}{v_1}$ and ${a_2} = {{{a_1}} \over {mn}}$ respectively. Here m and n are constants. The relations for distance and time in two systems respectively are :

A.
${{{n^3}} \over {{m^3}}}{L_1} = {L_2}$ and ${{{n^2}} \over m}{T_1} = {T_2}$
B.
${L_1} = {{{n^4}} \over {{m^2}}}{L_2}$ and ${T_1} = {{{n^2}} \over m}{T_2}$
C.
${L_1} = {{{n^2}} \over m}{L_2}$ and ${T_1} = {{{n^4}} \over {{m^2}}}{T_2}$
D.
${{{n^2}} \over m}{L_1} = {L_2}$ and ${{{n^4}} \over {{m^2}}}{T_1} = {T_2}$
2022 JEE Mains MCQ
JEE Main 2022 (Online) 27th June Evening Shift

The SI unit of a physical quantity is pascal-second. The dimensional formula of this quantity will be :

A.
[ML$-$1T$-$1]
B.
[ML$-$1T$-$2]
C.
[ML2T$-$1]
D.
[M$-$1L3T0]
2022 JEE Mains MCQ
JEE Main 2022 (Online) 27th June Morning Shift

A silver wire has a mass (0.6 $\pm$ 0.006) g, radius (0.5 $\pm$ 0.005) mm and length (4 $\pm$ 0.04) cm. The maximum percentage error in the measurement of its density will be :

A.
4%
B.
3%
C.
6%
D.
7%
2022 JEE Mains MCQ
JEE Main 2022 (Online) 26th June Evening Shift

The dimension of mutual inductance is :

A.
$[M{L^2}{T^{ - 2}}{A^{ - 1}}]$
B.
$[M{L^2}{T^{ - 3}}{A^{ - 1}}]$
C.
$[M{L^2}{T^{ - 2}}{A^{ - 2}}]$
D.
$[M{L^2}{T^{ - 3}}{A^{ - 2}}]$
2022 JEE Mains MCQ
JEE Main 2022 (Online) 26th June Morning Shift

An expression for a dimensionless quantity P is given by $P = {\alpha \over \beta }{\log _e}\left( {{{kt} \over {\beta x}}} \right)$; where $\alpha$ and $\beta$ are constants, x is distance; k is Boltzmann constant and t is the temperature. Then the dimensions of $\alpha$ will be :

A.
[M0 L$-$1 T0]
B.
[M L0 T$-$2]
C.
[M L T$-$2]
D.
[M L2 T$-$2]
2022 JEE Mains MCQ
JEE Main 2022 (Online) 25th June Morning Shift

If $Z = {{{A^2}{B^3}} \over {{C^4}}}$, then the relative error in Z will be :

A.
${{\Delta A} \over A} + {{\Delta B} \over B} + {{\Delta C} \over C}$
B.
${{2\Delta A} \over A} + {{3\Delta B} \over B} - {{4\Delta C} \over C}$
C.
${{2\Delta A} \over A} + {{3\Delta B} \over B} + {{4\Delta C} \over C}$
D.
${{\Delta A} \over A} + {{\Delta B} \over B} - {{\Delta C} \over C}$
2022 JEE Mains MCQ
JEE Main 2022 (Online) 24th June Evening Shift

Identify the pair of physical quantities that have same dimensions:

A.
velocity gradient and decay constant
B.
Wien's constant and Stefan constant
C.
angular frequency and angular momentum
D.
wave number and Avogadro number
2022 JEE Mains MCQ
JEE Main 2022 (Online) 24th June Morning Shift

Identify the pair of physical quantities which have different dimensions:

A.
Wave number and Rydberg's constant
B.
Stress and Coefficient of elasticity
C.
Coercivity and Magnetisation
D.
Specific heat capacity and Latent heat
2021 JEE Mains MCQ
JEE Main 2021 (Online) 1st September Evening Shift
A student determined Young's Modulus of elasticity using the formula $Y = {{Mg{L^3}} \over {4b{d^3}\delta }}$. The value of g is taken to be 9.8 m/s2, without any significant error, his observation are as following.

Physical
Quantity		 Least count of the
Equipment used
for measurement
Observed value
Mass (M) 1 g 2 kg
Length of bar (L) 1 mm 1 m
Breadth of bar (b) 0.1 mm 4 cm
Thickness of bar (d) 0.01 mm 0.4 cm
Depression ($\delta $) 0.01 mm 5 mm

Then the fractional error in the measurement of Y is :
A.
0.0083
B.
0.0155
C.
0.155
D.
0.083
2021 JEE Mains MCQ
JEE Main 2021 (Online) 31st August Evening Shift
If velocity [V], time [T] and force [F] are chosen as the base quantities, the dimensions of the mass will be :
A.
[FT$-$1 V$-$1]
B.
[FTV$-$1]
C.
[FT2 V]
D.
[FVT$-$1]
2021 JEE Mains MCQ
JEE Main 2021 (Online) 31st August Morning Shift
Match List - I with List - II.

List - I List - II
(a) Torque (i) MLT$^{ - 1}$
(b) Impulse (ii) MT$^{ - 2}$
(c) Tension (iii) ML$^{ 2}$T$^{ - 2}$
(d) Surface Tension (iv) MLT$^{ - 2}$


Choose the most appropriate answer from the option given below :
A.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
B.
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
C.
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
D.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
2021 JEE Mains MCQ
JEE Main 2021 (Online) 31st August Morning Shift
Which of the following equations is dimensionally incorrect?

Where t = time, h = height, s = surface tension, $\theta$ = angle, $\rho$ = density, a, r = radius, g = acceleration due to gravity, v = volume, p = pressure, W = work done, T = torque, $\in$ = permittivity, E = electric field, J = current density, L = length.
A.
$v = {{\pi p{a^4}} \over {8\eta L}}$
B.
$h = {{2s\cos \theta } \over {\rho rg}}$
C.
$J = \in {{\partial E} \over {\partial t}}$
D.
$W = \Gamma \theta $
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th August Evening Shift
Match List - I with List - II.

List - I List - II
(a) ${R_H}$ (Rydberg constant) (i) $kg\,{m^{ - 1}}{s^{ - 1}}$
(b) h (Planck's constant) (ii) $kg\,{m^2}{s^{ - 1}}$
(c) ${\mu _B}$ (Magnetic field energy density) (iii) $\,{m^{ - 1}}$
(d) $\eta $ (coefficient of viscocity) (iv) $kg\,{m^{ - 1}}{s^{ - 2}}$


Choose the most appropriate answer from the options given below :
A.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
B.
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
C.
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
D.
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th August Evening Shift
If force (F), length (L) and time (T) are taken as the fundamental quantities. Then what will be the dimension of density :
A.
[FL$-$4T2]
B.
[FL$-$3T2]
C.
[FL$-$5T2]
D.
[FL$-$3T3]
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th August Morning Shift
Which of the following is not a dimensionless quantity?
A.
Relative magnetic permeability ($\mu$r)
B.
Power factor
C.
Permeability of free space ($\mu$0)
D.
Quality factor
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th August Morning Shift
If E and H represents the intensity of electric field and magnetising field respectively, then the unit of E/H will be :
A.
ohm
B.
mho
C.
joule
D.
newton
2021 JEE Mains MCQ
JEE Main 2021 (Online) 26th August Evening Shift
Match List - I with List - II

JEE Main 2021 (Online) 26th August Evening Shift Physics - Units & Measurements Question 133 English

Choose the most appropriate answer from the options given below :
A.
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
B.
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
C.
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
D.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
2021 JEE Mains MCQ
JEE Main 2021 (Online) 26th August Evening Shift
If the length of the pendulum in pendulum clock increases by 0.1%, then the error in time per day is :
A.
86.4 s
B.
4.32 s
C.
43.2 s
D.
8.64 s
2021 JEE Mains MCQ
JEE Main 2021 (Online) 26th August Morning Shift
In a Screw Gauge, fifth division of the circular scale coincides with the reference line when the ratchet is closed. There are 50 divisions on the circular scale, and the main scale moves by 0.5 mm on a complete rotation. For a particular observation the reading on the main scale is 5 mm and the 20th division of the circular scale coincides with reference line. Calculate the true reading.
A.
5.00 mm
B.
5.25 mm
C.
5.15 mm
D.
5.20 mm
2021 JEE Mains MCQ
JEE Main 2021 (Online) 26th August Morning Shift
If E, L, M and G denote the quantities as energy, angular momentum, mass and constant of gravitation respectively, then the dimensions of P in the formula P = EL2M$-$5G$-$2 are :
A.
[M0 L1 T0]
B.
[M$-$1 L$-$1 T2]
C.
[M1 L1 T$-$2]
D.
[M0 L0 T0]
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th July Evening Shift
A physical quantity 'y' is represented by the formula $y = {m^2}{r^{ - 4}}{g^x}{l^{ - {3 \over 2}}}$

If the percentage errors found in y, m, r, l and g are 18, 1, 0.5, 4 and p respectively, then find the value of x and p.
A.
5 and $\pm$2
B.
4 and $\pm$3
C.
${{16} \over 3}$ and $ \pm {3 \over 2}$
D.
8 and $\pm$ 2
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th July Morning Shift
Assertion A : If in five complete rotations of the circular scale, the distance travelled on main scale of the screw gauge is 5 mm and there are 50 total divisions on circular scale, then least count is 0.001 cm.

Reason R :

Least Count = ${{Pitch} \over {Total\,divisions\,on\,circular\,scale}}$

In the light of the above statements, choose the most appropriate answer from the options given below :
A.
A is not correct but R is correct.
B.
Both A and R are correct and R is the correct explanation of A.
C.
A is correct but R is not correct.
D.
Both A and R are correct and R is NOT the correct explanation of A.
2021 JEE Mains MCQ
JEE Main 2021 (Online) 25th July Evening Shift
The force is given in terms of time t and displacement x by the equation

F = A cos Bx + C sin Dt

The dimensional formula of ${{AD} \over B}$ is :
A.
$[{M^0}L{T^{ - 1}}]$
B.
$[M{L^2}{T^{ - 3}}]$
C.
$[{M^1}{L^1}{T^{ - 2}}]$
D.
$[{M^2}{L^2}{T^{ - 3}}]$
2021 JEE Mains MCQ
JEE Main 2021 (Online) 20th July Evening Shift
If time (t), velocity (v), and angular momentum (l) are taken as the fundamental units. Then the dimension of mass (m) in terms of t, v and l is :
A.
$[{t^{ - 1}}{v^1}{l^{ - 2}}]$
B.
$[{t^1}{v^2}{l^{ - 1}}]$
C.
$[{t^{ - 2}}{v^{ - 1}}{l^1}]$
D.
$[{t^{ - 1}}{v^{ - 2}}{l^1}]$
2021 JEE Mains MCQ
JEE Main 2021 (Online) 17th March Morning Shift
The vernier scale used for measurement has a positive zero error of 0.2 mm. If while taking a measurement it was noted that '0' on the vernier scale lies between 8.5 cm and 8.6 cm, vernier coincidence is 6, then the correct value of measurement is ___________ cm. (least count = 0.01 cm)
A.
8.58 cm
B.
8.54 cm
C.
8.56 cm
D.
8.36 cm
2021 JEE Mains MCQ
JEE Main 2021 (Online) 16th March Evening Shift
In order to determine the Young's Modulus of a wire of radius 0.2 cm (measured using a scale of least count = 0.001 cm) and length 1m (measured using a scale of least count = 1 mm), a weight of mass 1 kg (measured using a scale of least count = 1 g) was hanged to get the elongation of 0.5 cm (measured using a scale of least count 0.001 cm). What will be the fractional error in the value of Young's Modulus determined by this experiment?
A.
0.14%
B.
9%
C.
1.4%
D.
0.9%
2021 JEE Mains MCQ
JEE Main 2021 (Online) 16th March Morning Shift
One main scale division of a vernier callipers is 'a' cm and nth division of the vernier scale coincide with (n $-$ 1)th division of the main scale. The least count of the callipers in mm is :
A.
${{10a} \over n}$
B.
${{10na} \over {(n - 1)}}$
C.
$\left( {{{n - 1} \over {10n}}} \right)a$
D.
${{10a} \over {(n - 1)}}$
2021 JEE Mains MCQ
JEE Main 2021 (Online) 26th February Evening Shift
If 'C' and 'V' represent capacity and voltage respectively then what are the dimensions of $\lambda$ where C/V = $\lambda$ ?
A.
$[{M^{ - 3}}{L^{ - 4}}{I^3}{T^7}]$
B.
$[{M^{ - 2}}{L^{ - 3}}{I^2}{T^6}]$
C.
$[{M^{ - 2}}{L^{ - 4}}{I^3}{T^7}]$
D.
$[{M^{ - 1}}{L^{ - 3}}{I^{ - 2}}{T^{ - 7}}]$
2021 JEE Mains MCQ
JEE Main 2021 (Online) 26th February Morning Shift
In a typical combustion engine the workdone by a gas molecule is given by $W = {\alpha ^2}\beta {e^{{{ - \beta {x^2}} \over {kT}}}}$, where x is the displacement, k is the Boltzmann constant and T is the temperature. If $\alpha$ and $\beta$ are constants, dimensions of $\alpha$ will be :
A.
$[{M^0}L{T^0}]$
B.
$[ML{T^{ - 1}}]$
C.
$[ML{T^{ - 2}}]$
D.
$[{M^2}L{T^{ - 2}}]$
2021 JEE Mains MCQ
JEE Main 2021 (Online) 25th February Evening Shift
If e is the electronic charge, c is the speed of light in free space and h is Planck's constant, the quantity ${1 \over {4\pi {\varepsilon _0}}}{{|e{|^2}} \over {hc}}$ has dimensions of :
A.
$[ML{T^{ - 1}}]$
B.
$[ML{T^0}]$
C.
$[{M^0}{L^0}{T^0}]$
D.
$[L{C^{ - 1}}]$
2021 JEE Mains MCQ
JEE Main 2021 (Online) 25th February Morning Shift
Match List - I with List - II :

List I List II
(a) h (Planck's constant) (i) $[ML{T^{ - 1}}]$
(b) E (kinetic energy) (ii) $[M{L^2}{T^{ - 1}}]$
(c) V (electric potential) (iii) $[M{L^2}{T^{ - 2}}]$
(d) P (linear momentum) (iv) $[M{L^2}{I^{ - 1}}{T^{ - 3}}]$


Choose the correct answer from the options given below :
A.
(a) $ \to $ (ii), (b) $ \to $ (iii), (c) $ \to $ (iv), (d) $ \to $ (i)
B.
(a) $ \to $ (i), (b) $ \to $ (ii), (c) $ \to $ (iv), (d) $ \to $ (iii)
C.
(a) $ \to $ (iii), (b) $ \to $ (ii), (c) $ \to $ (iv), (d) $ \to $ (i)
D.
(a) $ \to $ (iii), (b) $ \to $ (iv), (c) $ \to $ (ii), (d) $ \to $ (i)
2021 JEE Mains MCQ
JEE Main 2021 (Online) 25th February Morning Shift
The pitch of the screw gauge is 1 mm and there are 100 divisions on the circular scale. When nothing is put in between the jaws, the zero of the circular scale lies 8 divisions below the reference line. When a wire is placed between the jaws, the first linear scale division is clearly visible while 72nd division on circular scale coincides with the reference line. The radius of the wire is :
A.
1.80 mm
B.
0.90 mm
C.
0.82 mm
D.
1.64 mm
2021 JEE Mains MCQ
JEE Main 2021 (Online) 24th February Morning Shift
The work done by a gas molecule in an isolated system is

given by, $W = \alpha {\beta ^2}{e^{ - {{{x^2}} \over {\alpha kT}}}}$, where x is the displacement, k is the Boltzmann constant and T is the temperature. $\alpha$ and $\beta$ are constants. Then the dimensions of $\beta$ will be :
A.
$[{M^0}L{T^0}]$
B.
$[M{L^2}{T^{ - 2}}]$
C.
$[ML{T^{ - 2}}]$
D.
$[{M^2}L{T^2}]$
2020 JEE Mains MCQ
JEE Main 2020 (Online) 6th September Evening Slot
A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings 5.50 mm, 5.55 mm, 5.45 mm, 5.65 mm. The average of these four readings is 5.5375 mm and the standard deviation of the data is 0.07395 mm. The average diameter
of the pencil should therefore be recorded as :
A.
(5.54 $ \pm $ 0.07) mm
B.
(5.5375 $ \pm $ 0.0740) mm
C.
(5.5375 $ \pm $ 0.0739) mm
D.
(5.538 $ \pm $ 0.074) mm
2020 JEE Mains MCQ
JEE Main 2020 (Online) 6th September Morning Slot
A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking, prior to use. Upon one complete rotation of the circular scale, a displacement of 0.5mm is noticed on the pitch scale. The nature of zero error involved and the least count of the screw gauge, are respectively :
A.
Positive, 0.1 mm
B.
Positive, 0.1 $\mu $m
C.
Positive, 10 $\mu $m
D.
Negative, 2 $\mu $m
2020 JEE Mains MCQ
JEE Main 2020 (Online) 5th September Evening Slot
The quantities x = ${1 \over {\sqrt {{\mu _0}{\varepsilon _0}} }}$, y = ${E \over B}$ and z = ${l \over {CR}}$ are
defined where C-capacitance, R-Resistance, l-length, E-Electric field, B-magnetic field and ${{\varepsilon _0}}$, ${{\mu _0}}$, - free space permittivity and permeability respectively. Then :
A.
Only y and z have the same dimension
B.
x, y and z have the same dimension
C.
Only x and y have the same dimension
D.
Only x and z have the same dimension
2020 JEE Mains MCQ
JEE Main 2020 (Online) 5th September Morning Slot
A physical quantity z depends on four observables
a, b, c and d, as z = ${{{a^2}{b^{{2 \over 3}}}} \over {\sqrt c {d^3}}}$. The percentages of error in the measurement of a, b, c and d are 2%, 1.5%, 4% and 2.5% respectively. The percentage of error in z is :
A.
13.5 %
B.
14.5%
C.
16.5%
D.
12.25%
2020 JEE Mains MCQ
JEE Main 2020 (Online) 4th September Evening Slot
A quantity x is given by $\left( {{{IF{v^2}} \over {W{L^4}}}} \right)$ in terms of moment of inertia I, force F, velocity v, work W and Length L. The dimensional formula for x is same as that of :
A.
Coefficient of viscosity
B.
Force constant
C.
Energy density
D.
Planck's constant
2020 JEE Mains MCQ
JEE Main 2020 (Online) 4th September Morning Slot
Dimensional formula for thermal conductivity is (here K denotes the temperature):
A.
MLT–3K–1
B.
MLT–2K–2
C.
MLT–2K
D.
MLT–3K
2020 JEE Mains MCQ
JEE Main 2020 (Online) 3rd September Evening Slot
Amount of solar energy received on the earth’s surface per unit area per unit time is defined a solar constant. Dimension of solar constant is :
A.
MLT–2
B.
ML0T–3
C.
M2L0T–1
D.
ML2T–2
2020 JEE Mains MCQ
JEE Main 2020 (Online) 3rd September Morning Slot
Using screw gauge of pitch 0.1 cm and 50 divisions on its circular scale, the thickness of an object is measured. It should correctly be recorded as
A.
2.123 cm
B.
2.124 cm
C.
2.125 cm
D.
2.121 cm
2020 JEE Mains MCQ
JEE Main 2020 (Online) 2nd September Evening Slot
If momentum (P), area (A) and time (T) are taken to be the fundamental quantities then the dimensional formula for energy is
A.
[P2AT–2]
B.
$\left[ {{P^{{1 \over 2}}}A{T^{ - 1}}} \right]$
C.
$\left[ {P{A^{{1 \over 2}}}{T^{ - 1}}} \right]$
D.
[PA–1T–2]
2020 JEE Mains MCQ
JEE Main 2020 (Online) 2nd September Morning Slot
If speed V, area A and force F are chosen as fundamental units, then the dimension of Young’s modulus will be
A.
FA–1V0
B.
FA2V–1
C.
FA2V–2
D.
FA2V–3
2020 JEE Mains MCQ
JEE Main 2020 (Online) 2nd September Morning Slot
The least count of the main scale of a vernier callipers is 1 mm. Its vernier scale is divided into 10 divisions and coincide with 9 divisions of the main scale. When jaws are touching each other, the 7th division of vernier scale coincides with a division of main scale and the zero of vernier scale is lying right side of the zero of main scale. When this vernier is used to measure length of a cylinder the zero of the vernier scale between 3.1 cm and 3.2 cm and 4th VSD coincides with a main scale division. The length of the cylinder is : (VSD is vernier scale division)
A.
3.21 cm
B.
2.99 cm
C.
3.07 cm
D.
3.2 cm
2020 JEE Mains MCQ
JEE Main 2020 (Online) 9th January Evening Slot
For the four sets of three measured physical quantities as given below. Which of the following options is correct ?
(i) A1 = 24.36, B1 = 0.0724, C1 = 256.2
(ii) A2 = 24.44, B2 = 16.082, C2 = 240.2
(iii) A3 = 25.2, B3 = 19.2812, C3 = 236.183
(iv) A4 = 25, B4 = 236.191, C4 = 19.5
A.
A1 + B1 + C1 = A2 + B2 + C2 = A3 + B3 + C3 = A4 + B4 + C4
B.
A4 + B4 + C4 $ < $ A1 + B1 + C1 $ < $ A3 + B3 + C3 $ < $ A2 + B2 + C2
C.
A4 + B4 + C4 $ < $ A1 + B1 + C1 = A2 + B2 + C2 = A3 + B3 + C3
D.
A4 + B4 + C4 $ > $ A3 + B3 + C3 = A2 + B2 + C2 $ > $ A1 + B1 + C1
2020 JEE Mains MCQ
JEE Main 2020 (Online) 9th January Morning Slot
A quantity f is given by $f = \sqrt {{{h{c^5}} \over G}} $ where c is speed of light, G universal gravitational constant and h is the Planck's constant. Dimension of f is that of :
A.
Energy
B.
Momentum
C.
Area
D.
Volume
2020 JEE Mains MCQ
JEE Main 2020 (Online) 9th January Morning Slot
If the screw on a screw-gauge is given six rotations, it moves by 3 mm on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is :
A.
0.001 mm
B.
0.01 cm
C.
0.02 mm
D.
0.001 cm
2020 JEE Mains MCQ
JEE Main 2020 (Online) 8th January Morning Slot
The dimension of stopping potential V0 in photoelectric effect in units of Planck's constant 'h', speed of light 'c' and Gravitational constant 'G' and ampere A is :
A.
h1/3 G2/3 c1/3 A–1
B.
h0 c5 G-1 A-1
C.
h2/3 c5/3 G1/3 A–1
D.
h2 G3/2 c1/3 A–1
2020 JEE Mains MCQ
JEE Main 2020 (Online) 7th January Evening Slot
The dimension of ${{{B^2}} \over {2{\mu _0}}}$, where B is magnetic field and ${{\mu _0}}$ is the magnetic permeability of vacuum, is :
A.
ML2T–2
B.
MLT–2
C.
ML-1T–2
D.
ML2T–1