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In CGS system, the Young's modulus of a ...

In CGS system, the Young's modulus of a steel wire is `2 xx 10^(12)`. To double the length of a wire of unit cross-section area, the force

A

`4xx10^(6)` dynes

B

`2xx10^(12)` dynes

C

`2xx10^(14)` dynes

D

`2xx10^(8)` dynes

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The correct Answer is:
B
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MOTION-ELASTICITY-EXERCISE -3
  1. Two wires of same diameter of the same material having the length l an...

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  2. On increasing the length by 0.5 mm in a steel wire of length 2 m and a...

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  3. In CGS system, the Young's modulus of a steel wire is 2 xx 10^(12). To...

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  4. The material which practically does not exhibit elastic after effect i...

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  5. A force F is needed to break a copper wire having radius R. The force ...

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  6. The ratio of the adiabatic to isothermal elasticities of a triatomic g...

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  7. A brass rod of cross-sectional area 1cm^(2) and length 0.2 cm is compr...

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  8. A wire of length L and radius a rigidlyl fixed at one end. On stretchi...

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  9. In steel, the Young's modulus and the strain at the breaking point are...

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  10. Which of the following statements is correct:

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  11. Which one of the following substances possesses the highest elasticity...

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  12. Two wires of the same material have lengths in the ratio 1:2 and their...

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  13. When a weight of 10 kg is suspended from a copper wire of length 3 met...

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  14. When a force is applied on a wire of uniform cross-sectional area 3xx1...

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  15. A force of 10^3 newton, stretches the length of a hanging wire by 1 mi...

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  16. A wire of cross-sectional area 3 mm^(2) is first stretched between two...

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  17. For steel the breaking stressis 6xx10^(6)N//m^(2) and the density is 8...

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  18. The units of modulus of rigidity are

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  19. A 2m long rod of radius 1 cm which is fixed from one end is given a tw...

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  20. A ball falling in a lake of depth 200 m shows 0.1% decrease in its vol...

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