Two coaxial solenoids of different radii carry current I in the same direction. Let F 1 → be the magnetic force on the inner solenoid due to the outer one and F 2 → be the magnetic force on the outer solenoid due to the inner one. Then:

F 1 → is radially outwards and F 2 → = 0

F 1 → is radially inwards and F 2 → is radially outwards

F 1 → is radially inwards and F 2 → = 0

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A square loop, carrying a steady current $I$ , is placed in a horizontal plane near a long straight conductor carrying a steady current $I_{1}$ at a distance $d$ from the conductor as shown in figure. The loop will experience :

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Important Questions on Magnetic Effect of Current

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 11

Charge

q

is uniformly spread on a thin ring of radius

R

. The ring rotates about its axis with a uniform frequency

f Hz

. The magnitude of magnetic induction at the centre of the ring is

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 13

Two similar coils of radius

R

are lying concentrically with their planes at right angles to each other. The currents flowing in them are

I

and

2 I

respectively. The resultant magnetic field induction at the centre will be:

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 14

A proton carrying

1 MeV

kinetic energy is moving in a circular path of radius

R

in uniform magnetic field. What should be the energy of an

α

- particle to describe a circle of same radius in the same field ?

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 15

A magnetic needle suspended parallel to a magnetic field requires

\sqrt{3} J

of work to turn it through

60 °

. The torque needed to maintain the needle in this position will be

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 17

A current loop in a magnetic field

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 18

When a proton is released from rest in a room, it starts with an initial acceleration

a_{0}

towards west. When it is projected towards north with a speed

v_{0}

it moves with an initial acceleration

3 a_{0}

towards west. The electric and magnetic fields in the room are

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 19

Two identical long conducting wires

A O B

and

C O D

are placed at right angle to each other with one above other such that

O

is the common point for the two. The wires carry

I_{1}

and

I_{2}

currents, respectively. Point

P

is lying at distance

d

from

O

along a direction perpendicular to the plane containing the wires. The magnetic field at the point

P

will be,

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 20

An electron moving in a circular orbit of radius $r$ makes $n$ rotations per second. The magnetic field produced at the center has a magnitude,

A square loop, carrying a steady current I, is placed in a horizontal plane near a long straight conductor carrying a steady current I1 at a distance d from the conductor as shown in figure. The loop will experience :

Important Questions on Magnetic Effect of Current

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A square loop, carrying a steady current $I$ , is placed in a horizontal plane near a long straight conductor carrying a steady current $I_{1}$ at a distance $d$ from the conductor as shown in figure. The loop will experience :