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The length of potentiometer wire is 200 ...

The length of potentiometer wire is 200 cm and the emf of standard cell is primary circuit is E volts. It is employed to a battery of emf 0.4 v the balance point is obtained at l = 40 cm from positive end, the E of the battery is (cell in primary is ideal and series resistance is zone

A

4v

B

2v

C

5v

D

7v

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-CURRENT ELECTRICITY-EXERCISE - II
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  10. When 6 identical cells of no internal resistance are connected in seri...

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  11. The balancing length for a cell is 560cm in a potentiometer experiment...

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  12. The resistivity of a potentiometer wire is, if the area of cross secti...

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  13. A potentiomete wire of 10m length and 20 Ohm resistance is connected i...

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  14. A potentiometer has a wire of 100cm length and its resistance is 10 Oh...

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  15. The length of potentiometer wire is 200 cm and the emf of standard cel...

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  16. The emf of a cell is 2V and its internal resistance is 2 ohm. A resist...

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  17. A cell in secondary circuit gives null deflection for 2.5 m length of ...

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  18. A potentiometer wire of length L and a resistance r are connected in s...

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  19. The resistance of a wire is 'R' ohm. If it is melted and stretched to ...

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  20. A set of 'n' equal resistors, of value 'R' each, are connected in seri...

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