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A 10 m long wire of uniform cross sectio...

A 10 m long wire of uniform cross section and 20 `Omega` resistance is used in a potentiometer. The wire is connected in series with a battery of 5 V along with an external resistance of 480 `Omega`. If and unknown emf E is balanced at 6.0 m length of the wire,then the value of unknown emf is

A

1.2V

B

1.02V

C

0.2V

D

0.12V

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The correct Answer is:
D
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