Identify the physical effect involved

The disc is made of aluminium, which is a good conductor but nonmagnetic. So the interaction is not due to magnetic attraction; it is due to electromagnetic induction.

When the magnet is revolved above the disc, the magnetic field at a given part of the aluminium disc changes with time. Hence, eddy currents are induced in the disc.

Apply Faraday’s law and Lenz’s law

Because of the relative motion between the magnet and the conducting disc, induced currents are produced in the aluminium.

By Lenz’s law, the induced currents oppose the relative motion between the magnet and the disc.

Therefore, the disc experiences a torque tending to reduce this relative motion. So the disc starts rotating in the same direction as the revolving magnet.

What happens to temperature?

Eddy currents flow through the finite resistance of aluminium, causing Joule heating. So the disc’s temperature would rise slowly.

However, among the given options, the one that correctly describes the rotational motion is:

• It does rotate
• And it rotates in the same direction as the magnet

Check options

• A: Opposite direction — incorrect, because induced torque tries to reduce relative motion, not increase it.
• B: Same direction — correct.
• C: No rotation, no temperature rise — incorrect.
• D: No rotation, but temperature rises — incorrect, because torque is also produced.

Final answer

$\boxed{\text{B}}$

The disc rotates in the same direction as the magnet’s motion.