1

### IIT-JEE 1998

MCQ (More than One Correct Answer)
The SI unit of inductance, the henry can be written as
A
weber/ampere
B
volt-sec/amp
C
Joule/(ampere)2
D
ohm-second

## Explanation

Induction $L = {\phi \over i} =$ weber/Ampere

Also, $e = - L\left( {{{di} \over {dt}}} \right) \Rightarrow L = {{ - e} \over {(di/dt)}} = {{volt - {\mathop{\rm second}\nolimits} } \over {Ampere}}$

Also, $U = {1 \over 2}L{i^2} \Rightarrow L = {{2U} \over {{i^2}}} = {{Joule} \over {{{(Ampere)}^2}}}$

and $U = {1 \over 2}L{i^2} = {i^2}RT \Rightarrow L = RT =$ Ohm-second

2

### IIT-JEE 1995 Screening

MCQ (More than One Correct Answer)
The pairs of physical quantities that have the same dimensions is (are):
A
Reynolds number and coefficient of friction
B
Curie and frequency of a light wave
C
Latent heat and gravitational potential
D
Planck's constant and torque
3

### IIT-JEE 1986

MCQ (More than One Correct Answer)
The dimensions of the quantities in one ( or more ) of the following pairs are the same. Identify the pair(s)
A
Torque and Work
B
Angular momentum and Work
C
Energy and Young's modulus
D
Light year and Wavelength