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A potentiometer wire of length 100cm has...

A potentiometer wire of length 100cm has a resistance of `10Omega`. It is connected in series with a resistance and a cell of emf 2V and of negligible interal resistance. A source of emf 10mV is balanced against a length of 40cm of the potentiometer wire. What is the value of external resistance?

A

890 `Omega`

B

`600 Omega`

C

`650 Omega`

D

`790 Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
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RESONANCE ENGLISH-CURRENT ELECTRICITY-Exercise-1 (Part-2)
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  7. Two nonideal batteries are connected in parallel. Consider the followi...

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  9. Two cells of e.m.f. 10V & 15V are connected in parallel to each other ...

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  10. N sources of current with different emf's are connected as shown in Fi...

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  11. The reading of voltmeter is

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  12. The length of a wire of a potentiometer is 100 cm, and the emf of its ...

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  13. The current through the ammeter shown in figure is 1 A. If each of the...

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  14. The ammeter shown in figure consists of a 480 Omega coil connected in ...

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  15. A galvanometer, together with an unknown resistance in series, is conn...

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  16. A potentiometer wire of length 100cm has a resistance of 10Omega. It i...

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  17. The potentiometer wire AB shown in figure is 50cm long.When AD=30cm, n...

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  18. The current in a conductor and the potential difference across its end...

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  19. In this given circuit, no current is passing through the galvanometer....

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