If X, Y and Z in figure are identical lamps, which of the following changes to the brightness of the lamps occur when switch S is closed?

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X stays the same, Y decreases

X increases, Y decreases

X increases, Y stays the same

X decreases, Y increases

answer is B.

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Detailed Solution

P=V2R; Initially, I=V2RPower across PX=PY=V24RFinally, I=2V3R, Power PX=V29R,PY=PZ=V29RHence PX increases, PY decreases.

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