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Q.

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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a

X stays the same, Y decreases

b

X increases, Y decreases

c

X increases, Y stays the same

d

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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