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JEE Main 2021 (16 Mar, Shift 2) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from JEE Main 2021 (16 Mar, Shift 2)

Q28JEE Main 2021 · 16 MAR · SHIFT 2Easy

Electrical Power & Heating Effect

A resistor develops 500 J of thermal energy in 20 s when a current of 1.5A is passed through it. If the current is increased from 1.5A to 3A, what will be the energy developed in 20 s.

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Answer: (b)

$H \propto I^2$ for the same $R$ and $t$ .
$H' = 500 \times \left(\frac{3}{1.5}\right)^2 = 500 \times 4 = 2000\ \text{J}$ .
So the answer is (b) 2000 J.

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