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The e.m.f. E of the battery is balanced ...

The e.m.f. E of the battery is balanced by p. d. across 75 cm of a potentiometer wire. For a standard cell of e.m.f. 1.02 V, the balancing length is 50 cm. The value of E is

A

`0.68" V"`

B

`1.24" V"`

C

`1.53" V"`

D

`1.08" V"`

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