Question

A battery of emf $10V$ and internal resistance $3\Omega$ is connected to a resistor. The current in the circuit is $0.5A$. The terminal voltage of the battery when the circuit is closed is

• A. $10V$
• B. $0V$
• C. $1.5V$
• D. $8.5V$

Answer 1

The correct option is D $8.5V$

$\text{Terminal Voltage across the battery:}$

We know that the Terminal voltage across the battery($V_{AB}$) is given by:

$V_{AB}=E-Ir$

$=10V-\left(0.5A\right)3\Omega =8.5Volts$

Hence, Correct Option is D