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Motional EMF in an Open Conductor

A magnetic ne...

Question

A magnetic needle is kept in a non uniform magnetic field. It experiences:

A

a torque but not a force

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B

neither a force nor a torque

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C

a force and a torque

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D

a force but not a torque

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Solution

The correct option is C
a force and a torque

Magnetic needle kept in a non uniform field experiences both force as well as torque.

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Similar questions

Q. (i) Derive and expression for axial magnetic field of a bar magnet act as an equivalent solenoid.
(ii) A magnetized needle is a uniform magnetic field experience a torque but no net force. An ion nail near a bar magnet, however experience a force of attraction is addition to a torque. Why?

Q. Assertion :The net magnetic force on a current loop in a uniform magnetic field is zero but torque may or may not be zero. Reason: Torque on a current carrying coil in a magnetic field is given by

¯ τ = n I (¯ A X ¯ B) .

Q. In a uniform electric field, an electric dipole experiences only torque. But when the electric field is non-uniform, it experiences torque as well as a net force. Why is it so?

(A)

: When a magnet is placed in a non-uniform magnetic field , it experiences both translatory and rotatory motion.

Reason

(R)

: The poles of the bar magnet experiences resultant force and torque.

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d) oscillates

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