In the circuit shown in Fig. 12.3, when the switch is moved to ‘ON’ position,
(a) the bulb A will glow first.
(b) the bulb B will glow first.
(c) the bulb C will glow first.
(d) all bulbs will glow together.
As soon as the circuit gets completed, current is found at every point in the circuit instantly. So all bulbs will glow together.
Hence option (D) is correct.