A) the brightness of bulb A does not change and that of B decreases
B) the brightness of bulb A increases and that of B decreases
C) the brightness of A increases bulb B does not glow
D) the brightness of both bulbs A and B decrease
Correct Answer: B
Solution :
When switch S is pressed, the resistance of circuit decreases. Hence, the current in bulb A will increase but the current in bulb B will decrease. Hence, the brightness of bulb A will increase and that of bulb B will decrease.You need to login to perform this action.
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