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A potentiometer has a uniform wire of...

A potentiometer has a uniform wire of length 5 m . A battery of emf 10 V and negligible interal resistance is connected between its ends . A secondary cell connected to the circuit gives balancing length at 200 cm . The emf of the secondary cell is .

A

8 V

B

4 V

C

6 V

D

2 V

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