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Q.

The length of potentiometer wire is 100 cm and the emf of its standard cell is E volts. It is employed to measure the emf of a battery whose internal resistance is 0.5 ohm. If the balance point is obtained at l = 30 cm from positive end, the emf of the battery is

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a

30E100.5

b

30E100−0.5

c

30E100

d

100E30

answer is C.

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VαI,E'E=30100
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The length of potentiometer wire is 100 cm and the emf of its standard cell is E volts. It is employed to measure the emf of a battery whose internal resistance is 0.5 ohm. If the balance point is obtained at l = 30 cm from positive end, the emf of the battery is