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Difference Between Electromagnets and Permanent Magnets

An iron nail ...

Question

An iron nail near a bar magnet experiences(1) Only torque(2) Torque and force of attraction(3) Only force(4) Torque and force of repulsion

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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?

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.

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 :When a magnetic dipole is placed in a non uniform magnetic field, only a torque acts on the dipole. Reason: Force would also act on dipole if magnetic field were uniform.

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Difference Between Electromagnets and Permanent Magnets

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