Question

In the following circuit reading of voltmeter $V$ is

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

Answer 1

Answer: (A)

PD between $X$ and $Y$ is $V_{x Y}=V_{x}-V_{Y}=1 \times 4$
and PD between $X$ and $Z$ is
$V_{x z}=V_{x}-V_{z}=1 \times 16=16 \,V$

Now, we get potential difference between $Y$ and $Z$
i.e., reading of voltmeter is $V_{Y}-V_{Z}=12\, V$