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The reading of the voltmeter is [[1]] $V$ if both the keys are open of the circuit.

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Detailed Solution

If both the keys are open of the circuit, the reading of the voltmeter is

0 V

.
If both the keys are open, then the circuit will act as an open circuit, and no current will flow through the circuit, as for the current to flow, there needs to be a closed loop of the circuit with positive and negative terminals connected.

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