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Heating Effect of Current

If the curren...

Question

If the current passing through a heater is halved, then the heat produced by it becomes

A

2H

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B

4H

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C

H/2

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D

H/4

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Solution

The correct option is D. H/4
We know that,
H = I² R t,
If I_new = I/2, then

H_new = (I/2)² R t

H_new = (1/4) I² R t = H/4.

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