Question

In the following circuit reading of voltmeter V is

• A. 12 V
• B. 8 V
• C. 20 V
• D. 16 V

Answer 1

The correct option is A 12 V

P.d. between X and Y is $V_{XY}=V_X-V_Y=1\times 4=4V$ ....(i)
and p.d. between X and Z is $V_{XZ}=V_X-V_Z=1\times 16=16V$
On solving equations (i) and (ii) we get potential difference between Y and Z
i.e., reading of voltmeter is $V_Y-V_Z=12V$