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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 byH=V2tR  or  H∝1Rwhen .R is halved, the heat produced H will be doubled
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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