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How does the resistance of a wire change...

How does the resistance of a wire change when:
(i) its length is tripled?
(ii) its diameter is tripled?
(iii) its material is changed to one whose resistivity is three times?

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The correct Answer is:
(i) Resistance becomes 3 times (ii) Resistance becomes `(1)/(9)` th. (iii) Resistance becomes 3 times
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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. What would be the effect on the resistance of a metal wire of: (a) i...

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

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

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

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

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

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

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

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

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

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

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

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

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

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  15. The electrical resistivities of three materials P,Q and R are given be...

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  16. The electrical resistivities of four materials A,B,C and D are given b...

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  17. The electrical resistivities of five substances A,B,C,D and E are give...

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  18. SERIES COMBINATION

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  19. If five resistances, each of value 0.2 ohm, are connected in series, w...

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  20. State Ohm's law. Derive an expression for the equivalent resistance of...

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