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(a) Give one example to show how the res...

(a) Give one example to show how the resistance depends on the nature of material of the conductor.
(b) Calculate the resistance of an aluminium cable of length 10 km and diameter 2.0 mm if the resistivity of aluminium is `2.7 xx 10^(-8) Omegam`.

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The correct Answer is:
(b) `86 Omega`
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Calculate the resistance of an aluminium wire of length 50 cmand cross sectional area 2.0mm^(2) . The resistivity of aluminium is (rho)=2.6xx10^(-8)(Omega)m.

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Find the resistance of a hollow cylindrical conductor of length 1.0 m and inner and outer radii 1.0 mm and 2.0 mm respectively. The resistivity of the material is 2.0xx10^(-8) Omega m.

(a) Write down an expression for the resistance of a metallic wire in terms of the resistivity. (b) What will be the resistance of metal wire of length 2 metres and ares of cross-section 1.55 xx 10^(-6)m^(2) , if the resistivity of the metal be 2.8 xx 10^(-8) Omega m ?

Calculate the area of cross-section of a wire if its length is .0 m , its resistance is 23 Omega and the resistivity of the material is 1.84 xx 10^-6 Omega m .

What is the length of a wire of radius 0.2 mm and resitance 25 Omega ? The restivity of the material of the wire is 2pi xx 10^(-8) Omega.m.

Calculate the resistivity of a material of a wire 10 m long, 0.4 mm in diameter and having a resistance of 2.0 Omega .

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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. Will current flow more easily through a thick wire or a thin wire of t...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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