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Q.

A heater coil is cut in two equal parts and only one part is now used in the heater. The heat generated will now be

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a

four times

b

one fourth

c

halved

d

doubled

answer is D.

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Detailed Solution

The heat generated H is given by
$H = \frac{V^{2} t}{R} or H \propto \frac{1}{R}$
when .R is halved, the heat produced H will be doubled

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