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When the length and area of cross-sectio...

When the length and area of cross-section both are doubled, then its resistance

A

halved

B

unchanged

C

doubled

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
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NIKITA PUBLICATION-CURRENT ELECTRICITY-Multiple Choice Questions
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  2. S.I. unit of specific resistance is

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  3. When the length and area of cross-section both are doubled, then its r...

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  4. The specific resistance of all metals is most affected by

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  5. If 'n' is the number of free electrons in a metallic wire, then the re...

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  6. The example of an ohmic conductor is

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  7. The example for non- ohm ice resistance is

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  8. A metal wire of cross-sectional area 1m m^(2) contains 5xx10^(22) elec...

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  9. A nichrome wire of length 100 cm and area of cross-section 0.5 m m^(2)...

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  10. If a wire of resistance 25Omega is uniformly stretched until its lengt...

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  11. The resistance of a wire is 2 Omega. The wire is stretched to doubel i...

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  12. A certain piece of copper is to be shaped into a conductor of minimum ...

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  13. A wire of 50 cm long, 1mm^(2) in cross-section carries a current of 4 ...

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  14. Two wires of the same metal have same length, but their cross-sections...

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  15. A metallic wire carries a current of 100 A , its area of cross section...

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  16. A wire 1m long has a resistance of 1 Omega. If it is uniformly stretch...

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  17. In an electric circuit, potential difference across a lamp is 20 V and...

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  18. A cell of e.m.f. 2 V and internal resistance 2Omega and an external re...

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  19. Variation of current and voltage in a conductor is shown in the adjoin...

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  20. Which of the following I-V graph represents ohmic conductors?

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