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Electric Circuit

95.A potentio...

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95.A potentiometer wire of length 4m has a resistance of 8 ohms. It is connected in series with battery of e.m.f. 2 V and negligible internal resistance. If e.m.f. of a cell balances against a length of 217 cm of a potentiometer wire, find e.m.f. of cell. When cell is shunted by a resistance of 15 ohms, balancing length changes to 200 cm. Find the internal resistance of the cell

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A potentiometer has a wire of 100 cm length and its resistance is 10 ohms. It is connected in series with a resistance of 40 ohms and a battery of emf 2 V and negligible internal resistance. If a source of unknown emf E connected in the secondary is balanced by 40 cm length of potentiometer wire, the value of E is:

Q. A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of

2 V

and a negligible internal resistance. The potentiometer wire is

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2.85 m

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