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Q.

Two voltmeters Vright and Vleft, each with an internal resistance of 106Ω are connected through wires of negligible resistance. The ‘+’ side of both voltmeters is up as shown in the figure. A changing magnetic field is present in the shaded region. At a particular moment in time Vright reads 0.1V. At the same moment, the reading of voltmeter Vleft is

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a

0.2 V

b

– 0.2 V

c

0.1 V 

d

– 0.1 V

answer is C.

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Detailed Solution

Both voltmeters have equal internal resistances, so both will have the same 0.1V potential drop across themselves. The counter clockwise current enters the positive terminal of the left hand voltmeter, so it will read +0.1V.

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