The rest positions of the needles in a milliammeter and voltmeter not in use are as shown in Fig. A. When a student uses these in his experiment, the readings of the needles are in the positions shown in Fig. B. The corrected values of current and voltage in the experiment are

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42 mA and 3.2 V

42 mA and 4.0 V

34 mA and 3.2 V

34 mA and 4.0 V

answer is D.

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Detailed Solution

Concept: To answer this question, we must be certain of a body's floating state in both water and oil. In all circumstances, we must first assume the volume of the submerged body as well as the volume of the oil or water displaced by the submerged body. Then there are the floating circumstances to consider. We must respond to the numerous situations indicated in the question based on the following conditions.
Number of divisions on the scale of milliammeter

Least count of the milliammeter

Zero error

Reading on the main scale

Correct reading = Main reading - Zero error

Number of divisions on the voltmeter scale

Least count of the Voltmeter

Zero error

Reading on the main scale

Correct reading = Main reading - Zero error

Hence, the correct answer is option 4.

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