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A force F is needed to break a copper wi...

A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of same length and radius 2R will be

A

`F/2`

B

`2F`

C

`4F`

D

`F/4`

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The correct Answer is:
C
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MOTION-ELASTICITY-EXERCISE -3
  1. In CGS system, the Young's modulus of a steel wire is 2 xx 10^(12). To...

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

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

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

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

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

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

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  8. Which of the following statements is correct:

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

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

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

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

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

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

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

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  16. The units of modulus of rigidity are

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

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

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  19. An iron wire of length 4 m and diameter 2 mm is loaded with a weight o...

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  20. The dimensional formula for young's modulus is

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