A cell of e.m.f. 2 V and internal resistance 1.2 Ω is connected to an ammeter of resistance 0.8 Ω and two resistors of 4.5 Ω and 9 Ω as shown in figure.

Find —

(a) the reading of the ammeter,

(b) the potential difference across the terminals of the cell, and

(c) the potential difference across the 4.5 Ω resistor.

You have installed a new battery of emf 12 V and internal resistance 5.0 x 10^-2 Ω in your car. You self-start your car and it draws a current of 90 A. What would be the teminal voltage of battery when the self-starter is working ?

1 WH is equal to :

1. 3600 J
2. 360 J
3. 36 J
4. 3.6 J

The amount of heat produced in a wire on passing a current through it depends on:

1. the resistance of wire
2. the square root of current I passing through the wire.
3. the time for which current is passed.
4. Both (1) and (3)