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(a) Give two examples of substances whic...

(a) Give two examples of substances which are good conductors of electricity. Why do you think they are good conductors of electricity?
(b) Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is `1.7 xx 10^(-8) Omega m`.

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The correct Answer is:
(b) `86.5 Omega`
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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. (a) What do you understand by the ''resistivity'' of a substance? (b...

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  2. (a) Write down an expression for the resistance of a metallic wire in ...

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  3. (a) Give two examples of substances which are good conductors of elect...

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  4. Will current flow more easily through a thick wire or a thin wire of t...

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  5. How does the resistance of a conductor depend on: (a) length of the ...

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  6. (a) Give one example to show how the resistance depends on the nature ...

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  7. What would be the effect on the resistance of a metal wire of: (a) i...

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  8. How does the resistance of a wire vary with its: (a) area of cross-s...

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  9. How does the resistance of a wire change when: (i) its length is tri...

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  10. Calculate the area of cross-section of a wire if its length is 1.0 m, ...

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  11. (a) Define resistivity. Write an expression for the resistivity of a s...

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  12. The resistance of a wire of length 330m and cross-section area 1.0 mm^...

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  13. When the diameter of a wire is doubled, its resistance becomes:

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  14. If the resistance of a certain copper wire is 1Omega, then the resista...

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  15. If the diameter of a resistance wire is halved, then its resistance be...

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  16. The resistivity of a certain material is 0.6 Omegam. The material is m...

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  17. When the area of cross-section of a conductor is doubled, its resistan...

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  18. The resistivity of copper metal depends on only one of the following f...

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  19. If the area of cross-section of a resistance wire is halved, then its ...

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  20. A piece of wire of resistance 20 Omega is drawn so that its length is ...

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