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A potentiometer wire of length 100 cm ha...

A potentiometer wire of length 100 cm has a resistance of `100Omega` it is connected in series with a resistance and a battery of emf 2 V and of negligible internal resistance. A source of emf 10 mV is balanced against a length of 40 cm of the potentiometer wire. what is the value of the 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-CURRENT ELECTRICITY-Exercise-1 (Part-2)
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  3. The equivalent resistance between the points A and B is:

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  4. A battery of internal resistance 4Omega is connected to the network of...

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  5. In these circuits all the batteries are indentical and have negllgible...

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  6. Two nonideal batteries are connected in parallel. Consider the followi...

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  7. Twelve cells each having the same e.m.f are connected in series and...

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

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

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  10. The reading of voltmeter is

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  11. The length of a wire of a potentiometer is 100 cm, and the e.m.f. of i...

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

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  13. The ammeter shown in the figure consists of a 480Omega coil conneted i...

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  14. A galvanometer together with an unkonwn resistance in series is connec...

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  15. A potentiometer wire of length 100 cm has a resistance of 100Omega it ...

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

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

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

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  19. In the circuit P != R, the reading of the galvanometer is same with s...

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  20. Salt water contains n sodium ions (Na+) per cubic meter and n chloride...

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