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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEP
Chapter: Current Electricity

Olympiad workbook · NSEP · Current Electricity

If a cell of constant emf produces the same amount of heat during...

If a cell of constant emf produces the same amount of heat during the same time in two independent resistors

R_1

and

R_2

when they are separately connected across the terminals of the cell, one after the other. The internal resistance of the cell is

Options

A $\frac{\mathrm{R}_1+\mathrm{R}_2}{2}$
B $\frac{\mathrm{R}_1 \sim \mathrm{R}_2}{2}$
C $\frac{\sqrt{\mathrm{R}_1^2+\mathrm{R}_2^2}}{2}$
D $\sqrt{\mathrm{R}_1 \mathrm{R}_2}$

Correct answer

D. $\sqrt{\mathrm{R}_1 \mathrm{R}_2}$

Step-by-step solution

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