Question

Two batteries, one of emf $18V$ and internal resistance $2\Omega$ the other of emf $12V$ and internal resistance $1\Omega$, are connected as shown. The voltmeter $V$ will record a reading of:

• A. $15V$
• B. $30V$
• C. $14V$
• D. $18V$

Answer 1

The correct option is C $14V$

From Kirchhoff law

$I\times 2+I\times 1=18-12=6$

Current in the circuit,$=\frac{V}{R}=\frac{6}{3}=2A$

Voltage drop across $2\Omega$

$V_1=2\times 2=4V$

Voltmeter reading $=18-4=14V$

hence, option $C$ is correct answer.