Question

By error, a student places a moving-coil voltmeter $V$ (nearly ideal) in series with the resistance in a circuit in order to read the current, as shown. The voltmeter reading will be

• A. $0$
• B. $4\text{V}$
• C. $6\text{V}$
• D. $12\text{V}$

Answer 1

The correct option is D $12\text{V}$

A voltmeter is said to be ideal if its resistance is infinite, means current from the circuit element will be zero.


Since, current flowing will be zero hence voltmeter will measure potential of the battery only.

So, reading of voltmeter across points $\text{A}$ and $\text{B}$ will be $12\text{V}$.

Hence, option $\left(D\right)$ is the correct answer.