Three bulbs `B_(1), B_(2) and B_(3)` are connected to the mains as shown in Fig. `7.28`. How will the brightness of bulb `B_(1)` be affected `B_(2) or B_(3)` are disconnected from the circuit?

Options

A. Bulb `B_(1)` becomes brighter
B. Bulb `B_(1)` becomes dimmer.
C. No change occurs in the brightness.
D. Bulb `B_(1)` becomes brighter if bulb `B_(2)` is disconnected and dimmer if bulb `B_(3)` is disconnected.

Answer

A

Explanation

After disconnecting `B_(2) and B_(3)` , the whole of potential difference will be across `B_(1)`. Hence , potential difference across `B_(1)` increases, so its brightness increases.