In the circuit shown,R_1 is increased. What h | vedclass

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(D) The circuit consists of a voltage source $V$ connected in parallel to two branches.One branch contains resistors $R_1$ and $R_2$ in series.The oth

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Does not change

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(D) The circuit consists of a voltage source $V$ connected in parallel to two branches.One branch contains resistors $R_1$ and $R_2$ in series.The other branch contains resistor $R_3$ connected in parallel with the voltmeter.Since the voltmeter is connected directly across the terminals of the ideal voltage source $V$,the potential difference across the voltmeter is equal to the electromotive force $(EMF)$ of the source,which is $V$.An ideal voltmeter has infinite resistance,so it does not affect the circuit.Changing the value of $R_1$ affects the current flowing through the branch containing $R_1$ and $R_2$,but it does not change the potential difference across the branch containing $R_3$ and the voltmeter,as both branches are connected in parallel to the same constant voltage source $V$.Therefore,the reading of the voltmeter remains $V$ and does not change.

In the circuit shown,$R_1$ is increased. What happens to the reading of the voltmeter (ideal)?

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