`B_(1)B_(2)` and `B_(3)` are three identical bulbs connected to a battery of steady e.m.f. with key K closed What happens to the brightness of the bulbs `B_(1)` and `B_(2)` when the key is opened ?

Options

A. Brightness of the bulbs `B_(1)` increases and that of `B_(2)` decreases.
B. Brightness of the bulbs `B_(1)` and `B_(2)` increases.
C. Brightness of the bulb `B_(1)` decreases and that of `B_(2)` increases
D. Brightness of the bulbs `B_(1)` and `B_(2)` decreases.

Answer

C

Explanation

Brightness of the bulb `B_(1)` decreases and that of `B_(2)` increases