EASY

JEE Main/Advance

IMPORTANT

Earn 100

A uniform circular ring of radius $R,$ mass $m$ has uniformly distributed charge $q .$ The ring is constrained to rotate about its own axis (which is vertical) without friction. In the space a uniform magnetic field $B,$ directed vertically down ward exists in a cylindrical region. The cylindrical region is co-axial with $B$ and has a radius greater than $R .$ If $B$ increases at a constant rate, $\frac{d B}{d t} = α,$ angular acceleration of the ring will

50% studentsanswered this correctly

Important Questions on Electromagnetic Induction

EASY

JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 18

A circular conducting ring is rotated about one its diameter in a magnetic field

EASY

JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 19

Figure shows two circular rings of radii

a & b (a > b)

joined together by wire of negligible resistance. If the arrangement is placed in a time varying magnetic field,

\frac{d B}{d t} = k

and if the resistance per unit length of wire is

λ,

then induced current is

Question Image

MEDIUM

JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 20

An electric motor runs a DC source of emf 200V and draws a current of 10A. If the efficiency is 40%, then the resistance of the armature is

EASY

JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 21

Figure shows part of a circuit. If

I = 5 A

and is decreasing at a constant rate of

10^{3} A / s

then

V_{B} - V_{A}

Question Image

MEDIUM

JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 22

Two different coils have self inductances

L_{1} = 8 mH

and

L_{2} = 2 mH .

The current in both the coil is increased at same constant rate. At a certain instant power given to two coils is same. At that time the energy stored in both the coils are

V_{1} & V_{2}

respectively, then

\frac{V_{1}}{V_{2}}

MEDIUM

JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 23

A short solenoid of length

4 c m

, radius

2 c m

and

100

turns is placed inside and on the axis of a long solenoid of length

80 c m

and

1500

turns. A current of

3

A flows through the short solenoid. The mutual inductance of two solenoids is

MEDIUM

JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 24

In the arrangement shown, what is the expression for emf induced in the smaller loop of radius

r ?

The current

I

varies as

I = 3 t + 5 (R > > r)

Question Image

HARD

JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 25

A uniformly wound solenoid coil of self-inductance

1.8 \times 10^{- 4} H

and resistance

6 Ω

is broken up into two identical coils. These identical coils are then connected in parallel across a

12 V

battery of negligible resistance. The time constant for the current in the circuit is

Important Questions on Electromagnetic Induction

Learn and Prepare for any exam you want !