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Question

# The current in a circuit is doubled, keeping other parameters constant. The heat generated in the circuit will be _________ of its initial value.

A

2 times

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B

4 times

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C

3 times

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D

8 times

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Solution

## The correct option is B 4 times According to joule's law of heating: Heat generated, H=I2Rt when current I flows through the resistance R for time t Now the current is doubled. So current flowing through the same resistance becomes 2I. Now, heat generated H′=(2I)2Rt H′=4(I)2Rt H′=4H Hence, heat generated will be four times of its initial value.

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