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: - Physics MCQ AIEEE 2026 | ExamTest.live | ExamTest.live

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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:

A $doubled$
B $four times$
C $one fourth$
D $halved$

Solution & Step-by-step Explanation

Heat generated per unit time H = \frac{V ^{2}}{R} .When the coil is cut in half, its resistance R^{'} becomes R /2 .New heat generated H^{'} = \frac{V ^{2}}{R ^{'}} = \frac{V ^{2}}{R /2} = 2 (\frac{V ^{2}}{R}) = 2 H .The heat generated is doubled.

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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:

A

doubled

B

four times

C

one fourth

D

halved

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Electricity Heating Effect

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