Consider the two circuits A and B given alongside :

In the circuits A and B shown here, the voltmeter reading would be :
(1) nearly 4.5 V in both the circuits
(2) 0 V in both the circuits
(3) nearly 1 V for circuit A and nearly 4.5 V for circuit B
(4) 0 V for circuit A and nearly 4.5 V for circuit B

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Solution

As the switch in circuit A is not closed so there will not be any current in the circuit, hence no voltage drop across the resistors. That's why the reading of voltmeter in the circuit will be zero.

The switch is closed in circuit B, as the resistance of the ammeter is taken as negligible, so the voltage across the resistances connected in parallel will be equal to the voltage of the battery. That's why voltage reading in the voltmeter in circuit B will be 4.5 V.

Hence, the correct answer is option 4.

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