Figure shows three similar lamps P,Q and R connected across a power supply. If the lamp R fuses, how will the light emitted by P and Q change?

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No change

Brilliance of P decreases and hat of Q increases

Brilliance of both P and Q increases

Brilliance of both P and Q decreases

answer is B.

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Detailed Solution

before fusing resistance raio 2:1 potential across P 2V3 after fuse potential across P v2 as resistance ratio is 1:1 so brilliance of P decreases and Q increases as Power=V2R

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