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A coaxial cable is made up of two conductors. The inner conductor is solid and is of radius $R_{1}$ and the outer conductor is hollow of inner radius $R_{2}$ and outer radius $R_{3}$ . The space between the conductors is filled with air. The inner and outer conductors are carrying currents of equal magnitudes and in opposite directions. Then the variation of magnetic field with distance from the axis is best plotted as

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Important Questions on Magnetic Effect of Current

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Beta Question Bank for Engineering: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-2>Q 43

From a cylinder of radius

R

, a cylinder of radius

R / 2

is removed, as shown. Current flowing in the remaining cylinder is

I

. Magnetic field strength is -

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Beta Question Bank for Engineering: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-2>Q 44

A long straight metal rod has a very long hole of of radius '

a

' drilled parallel to the rod axis as shown in the figure. If the rod carries a current '

i

' find the value of magnetic induction on the axis of the hole, where

O C = c

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Beta Question Bank for Engineering: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-2>Q 45

Two large conducting current planes perpendicular to

x

-axis are placed at

(d, 0)

and

(2 d, 0)

as shown in figure. Current per unit width in both the planes is same and current is flowing in the outward direction. The variation of magnetic induction as function of '

x

(0 \leq x \leq 3 d)

is best represented by -

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Beta Question Bank for Engineering: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-2>Q 46

A short bar magnet placed with its axis at

30^{\circ}

with a uniform external magnetic field of

0 .16 T

experiences a torque of magnitude

0 .032 J

. The magnetic moment of the bar moment will be

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Beta Question Bank for Engineering: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-2>Q 48

A nonconducting disc having uniform positive charge

Q

, is rotating about its axis with uniform angular velocity

ω

. The magnetic field at the centre of the disc is -

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Beta Question Bank for Engineering: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-2>Q 49

An electron experiences a force $[(4 .0 \hat{i} + 3 .0 \hat{j}) \times 10^{- 13}] N$ , in a uniform magnetic field when its velocity is $[(2 .5 \times 10^{7}) \hat{k}] m s^{- 1}$ . When the velocity is redirected and becomes $[(1 .5 \hat{i} - 2 .0 \hat{j}) \times 10^{7}] m s^{- 1}$ , the magnetic force of the electron is zero. The magnetic field vector $\vec{B}$ is:

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Beta Question Bank for Engineering: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-2>Q 50

Net magnetic field at the centre of the circle

O

due to a current carrying loop as shown in figure is

(θ < 180^{\circ})

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Beta Question Bank for Engineering: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-2>Q 51

A particle of charge

q

and mass

m

starts moving form the origin under the action of an electric field

\vec{E} = E_{0} \hat{i}

and

\vec{B} = B_{0} \hat{i}

with velocity

\vec{v} = v_{0} \hat{j}

. The speed of the particle will become

2 v_{0}

after a time.

Important Questions on Magnetic Effect of Current

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