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Consider a simple circuit shown in Figure variable resistance R’. R’ can vary from $R_0$ to infinity. r is internal resistance of the battery $(r<<R<<R_0).$

A. Potential drop across AB is nearly constant as R’ is varied.
B. Current through R is nearly a constant as R’ is varied.
C. Current I depends sensitively on R’.
D. $I\geqslant \frac{V}{r+R}$ always.

Answers (1)

The correct answers are the options (a,d)

Explanation:

$I=\frac{V}{r+R_{eq}}$

As $r+R<r+R_{eq}$

$I=\frac{V}{r+R_{eq}}\leq \frac{V}{r+R}$

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