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Four Fundamental Forces

A magnetic ne...

Question

A magnetic needle suspended freely in a uniform magnetic field experiences torque but no net force. A nail made up of iron kept near a bar magnet experience a force of attraction and torque. Give reason.

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Solution

Due to the non uniform magnetic field of the bar magnet, the nail experiences a torque as well as translatory force of attraction.

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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?

(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.

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) .

When a bar magnet is suspended freely in a uniform magnetic field, identify the correct statements:

a) The magnet experiences only couple and undergoes only rotatory motion

b) The direction of torque is along the suspension wire

c) The magnitude of torque is maximum when the magnet is normal to the field direction

Q. Assertion :No net force acts on a rectangular coil carrying a steady current when suspended freely in a uniform magnetic field. Reason: Force on coil in magnetic field is always non-zero.

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