In the experiment on finding the equivalent resistance of two resistors, connected in parallel, three students connected the voltmeter in their circuits, in the three ways X, Y and Z shown here.

The voltmeter has been correctly connected in
(1) cases X and Y only
(2) cases Y and Z only
(3) cases Z and X only
(4) all the three cases

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Solution

To measure the equivalent resistance between the two resistors, the voltmeter should be connected in parallel with the resistors and the ammeter should be connected in the series, and the current should be entering from the positive terminal and leaving from the negative terminal of the ammeter and the polarity of the voltmeter should also be in accordance with the polarity of the resistors.

As in all three given circuits voltmeter is properly placed. Hence the Correct answer is Option 4.

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