Question

When the switches are arranged so that the current through the battery is maximum, what is the voltage across points $A$ and $B$?

• A. $4\text{V}$
• B. $0\text{V}$
• C. $1\text{V}$
• D. $2\text{V}$

Answer 1

The correct option is B $0\text{V}$

We know that current through the battery is maximum when $R_{eq}$ of circuit across the battery is minimum.

When $S_1$ is closed
current through the battery is maximum as $R_{eq}$ of circuit across the battery is minimum and equal to $1\Omega$
$\therefore i=\frac{24}{1}=24\text{Ampere}$
$\because$ The current through $AB$ is zero.
$\Rightarrow$ Voltage across $AB$ is $0\text{V}$.