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JEE Main 2005 (AIEEE) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from JEE Main 2005 (AIEEE)

Q72JEE Main 2005 · AIEEEEasy

Electrical Power & Heating Effect

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

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Answer: (b)

Half the coil has resistance $\frac{R}{2}$ ; supply voltage is the same.
$P = \frac{V^2}{R} \propto \frac{1}{R}$ , so the power (heat per unit time) doubles.
So the answer is (b) doubled.

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