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The emf of the battery shown in figure i...

The emf of the battery shown in figure is

A

12 V

B

16 V

C

18 V

D

15 V

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The emf E and the internal resistance r of the battery shown in figure are 4.3V and 1.0Omega respectively. The external resistan ce R is 50Omega . The resistance of the ammeter and voltameter are 2.0Omega an d 200Omega respectively. Find the respective reading of the voltmeter.

The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is 0.5 Omega . If the balance point is obtained at I = 30 cm from the positive end, the e.m.f. of the battery is . where i is the current in the potentiometer wire.

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