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Three 100W, 150V lamps are connected acr...

Three `100W, 150V` lamps are connected across a `150V power line as shown. Find (a) Voltage across each lamp and (b) total power dissipated in three bulbs.

A

Brightness of A increase but that of `C` decrease

B

Brightness of A increase the same but that of `C` decrease

C

Brightness of both`A `and `C` decrease

D

Brightness of A increase but that of `C` remain the same

Text Solution

Verified by Experts

The correct Answer is:
a
When the swich is closed bulb `B` gets connected in parallel to bulb `C` in the circuit Due to it ,The effective resistance of the circuit increase since bridghtness of a bulb `A` increase Now the current of bulb `C` is shured by the `B` therefoer the brightness of the bulb `C` decrease
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