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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