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The electric potential variation around ...

The electric potential variation around a single closed loop contining an ideal battery and one of more resistors is shown in figure. If current of `1 A` flows in the circuit,

A

two resistor and two batteries

B

one resistor and three batteries

C

maximum net emf of volt

D

three resistor

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The correct Answer is:
D
(d) We notice that potential increases twice and drops twice. If the circuit had only one battery and three resistance, the currents in all three batteries would definitely be in same direction. Either potential would increase along all three resistances or it would decreases along each.
This is different from the situation given in graph.
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