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]

State two ways to increase the speed of rotation of a D.C. motor.

Calculate the effective resistance across AB :

(i) State whether the specific heat capacity of a substance remains the same when it's state changes from solid to liquid.

(ii) Give one example to support your answer.