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Question

# Assertion :In a chain of bulbs, 50 bulbs are joined in series. One bulb is fused now. If the remaining 49 bulbs are again connected in series across the same supply then light gets decreased in the room. Reason: The resistance of 49 bulbs will be more then 50 bulbs in parallel.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

## The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionThe resistance of 49 bulbs will be less than 50 bulbs in series. Since, heat produced H=I2Rt, so R decreases, also heat produced as well as brightness will decrease.The resistance of 49 bulbs will be more than 50 bulbs in parallel - this correct because of R/49>R/50 where R, the resistance of each bulb. Ans: B

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