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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEP
Chapter: Current Electricity

Olympiad workbook · NSEP · Current Electricity

Two cells each of emf E and internal resistances r_1 and r_2...

Two cells each of emf

E

and internal resistances

r_1

and

r_2

respectively are connected in series with an external resistance

R

. The potential difference between the terminals of the first cell will be zero when

R

is equal to

Options

A $\frac{r_1+r_2}{2}$
B $\sqrt{r_1^2-r_2^2}$
C $r_1-r_2$
D $\frac{r_1 r_2}{r_1+r_2}$

Correct answer

C. $r_1-r_2$

Step-by-step solution

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