The set up in the figure is used to study the relationship between current (I) and potential difference (V) for a wire X.

The rheostat Y is used to:

The value of X for which the galvanometer in the figure shows a null deflection is:

In the comparison of heat and electrical energy flowing along a well insulated conductor which of these is/are true?

1) The Pd across the ends of the conductor is analogous to the temperature difference between the ends of the conductor.

2) The electric current is analogous to the rate of flow of heat.

3) The electrical resistance is analogous to the of thermal conductivity.

Which of the following statements describes an electric generator?

An impulse of 100 N is applied to an object.

If this same impulse is delivered over a longer time interval: