Question

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

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

Answer 1

Answer: (D)

8.5 V

Answer 2

terminal Voltage of the battery after closing the circuit is
$V=E-ir$
$=10-0.5\times 3$
$=10-1.5$
$=8.5\,V$