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A rectangular loop of width $b = (e - 1) a,$ length I, mass $m$ and resistance $R$ is placed closed to and coplanar with a very long fixed straight conductor carrying $I_{0} .$ The current in the conductor is suddenly switched off. Velocity of loop after current is switched off, is

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Important Questions on Electromagnetic Induction

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 5

In the given

L R

circuit, switch

S

is closed at

t = 0 .

The energy stored in the magnetic field, at time

t_{0} = \frac{3 L}{2 R} \ln 2

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 6

Two points

B

and

C

are such that length of

A B

and

B C

l_{1}

and

l_{2}

respectively are placed inside an infinite solenoid as shown in figure. The current through solenoid is varying with time. Line

A B

and

B C

are in plane perpendicular to solenoid axis. If strength of induced electric field at

B

and

C

are same then value of

θ,

is
(Given :

l_{1} + l_{2} <

radius of solenoid. And Point

A

is centre of the cross-sectional area).

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 8

A rectangular coil is being rotated about an axis as shown. A long current carrying wire is along the axis of rotation. Then the induced emf in this coil will be

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 9

There exist a magnetic field perpendicular to the loop which varies uniformly with rate

α .

Loop radius is a and resistance of the loop is $R .$ Induced power in the loop is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 13

The primary and secondary coils of a transformer have

50

and

1500

turns, respectively. If the magnetic flux

ϕ

linked with the primary coil is given by

ϕ = ϕ_{0} + 4 t

, where

ϕ

is in

Wb

t

is in

s

and

ϕ_{0}

is a constant, the output voltage across the secondary coil is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 14

A solenoid of inductance

L

and resistance

R

has a soft iron core. It is connected to a battery of E.M.F

E

as shown in the figure and allowed to attain its steady state.

Q.15-16.jpg

At an instant, the iron core is suddenly pulled out and because of it, inductance decreases to

\frac{L}{3}

.
The work done by an external agent in pulling out the iron core is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 15

A solenoid of inductance $L$ and resistance $R$ has soft iron core. It is connected to a battery of emf $E$ as shown in figure and allowed to attain its steady state.

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At an instant, the iron core is suddenly pulled out and because of it inductance decreases to $\frac{L}{3}$ . If the iron core is pulled out completely at time $t = 0,$ then the current in the circuit as a function of time is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 1

A conducting ring of radius

R

is being moved in a region of uniform magnetic field as shown. Let

E_{A B}

represent the potential difference between

A

and

B

then

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A rectangular loop of width b=(e-1) a, length I, mass m and resistance R is placed closed to and coplanar with a very long fixed straight conductor carrying I0. The current in the conductor is suddenly switched off. Velocity of loop after current is switched off, is

Important Questions on Electromagnetic Induction

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A rectangular loop of width $b = (e - 1) a,$ length I, mass $m$ and resistance $R$ is placed closed to and coplanar with a very long fixed straight conductor carrying $I_{0} .$ The current in the conductor is suddenly switched off. Velocity of loop after current is switched off, is