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The figure shows an $L$ -shaped rod rotating about its end $O$ in a plane perpendicular to a magnetic field $B .$ The part $O A$ of rod is non conducting while $A B$ is conducting the emf induced between $A$ and $B$ 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 Set-2>Q 14

In a region of space, magnetic field exists in a cylindrical region of radius a centred at origin with magnetic field along negative

z

-direction. The field is given by

\vec{B} = - B_{0} t \hat{k} .

The force experienced by a stationary charge

q

placed at

(r, 0, 0),

where

r > a,

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 15

A conducting rod of length

L

slides at a constant velocity

V

on two parallel conducting rails as shown in figure. The mechanical power required to pull the rod at constant velocity is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 16

A semicircle conducting ring of radius $R$ is placed in $X Y$ plane as shown in figure. A uniform magnetic field exist along $x$ -axis. No emf will be induced, if

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 17

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 .

B

increases at a constant rate,

\frac{d B}{d t} = α,

angular acceleration of the ring will

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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

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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

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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

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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}

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The figure shows an L-shaped rod rotating about its end O in a plane perpendicular to a magnetic field B. The part OA of rod is non conducting while AB is conducting the emf induced between A and B is

Important Questions on Electromagnetic Induction

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The figure shows an $L$ -shaped rod rotating about its end $O$ in a plane perpendicular to a magnetic field $B .$ The part $O A$ of rod is non conducting while $A B$ is conducting the emf induced between $A$ and $B$ is