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?
A
X stays the same, Y decreases
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B
X increases, Y decreases
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C
X increases, Y stays the same
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D
X decreases, Y increases
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Solution
The correct option is BX increases, Y decreases Resistance of circuit decreases that increases current through X. So, it's brightness increase. The voltage across Y decreases so, it's brightness will decreases.