A) The brightness of A increases & that of B decreases
B) the brightness of A doesn't change & that of B decreases
C) the brightness of both A & B decreases
D) the brightness of A increases and that of B does not change
Correct Answer: A
Solution :
As the switch is closed the equivalent resistance of the system decreases and hence current through circuit and hence through A increases, so brightness of A increases But current through B decreases and hence its brightness decreases.
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