Name and state the rule by which the polarity at the ends of a current carrying solenoid is determined.

A magnet kept at the centre of two coils A and B is moved to and fro as shown in the diagram. The two galvanometers show deflection.

State with a reason whether :

x > y

or

x < y [x and y are magnitudes of deflection]

The diagram in figure shows a small magnet placed near a solenoid AB with it's north pole N near the end A. Current is switched on in the solenoid by pressing the key K.

(a) State the polarity at the ends A and B.

(b) Will the magnet be attracted or repelled? Give a reason for your answer.

Why does a current carrying freely suspended solenoid rest along a particular direction? State the direction in which it rests.