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B(1)B(2) and B(3) are three identical bu...

`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 ?

A

Brightness of the bulbs `B_1` and `B_2` decreases.

B

Brightness of the bulb, `B_1` decreases and that of `B_2` increases.

C

Brightness of the bulbs `B_1` and `B_2` increases

D

Brightness of the bulbs `B_1` increases and that of `B_2` decreases.

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