Question

By error, a student places 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. $4V$
• C. $6V$
• D. $12V$

Answer 1

The correct option is D $12V$

So if connected in series, a very small current will flow or no current will flow. An ideal voltmeter draws $0$ current from the circuit. So when we arrange it in series, It doesn't work as a voltmeter but as resistance and also the reading is shown by the voltmeter is the voltage across its terminals.

The voltmeter reading will be $12V$.