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When a steel wire fixed at one end is pu...

When a steel wire fixed at one end is pulled by a constant force F at its other end , its length increases by l.Which of the following statements is not correct?

A

work done by the external force is FL.

B

some heat is produced in the wire in the process

C

the elastic potential energy of the wire is `(FL)/(2)`

D

the heat produced is equal to the half of the elastic potential energy stored in the wire

Text Solution

Verified by Experts

The correct Answer is:
D
(d) The heat produced is equal to half of the elastic potential energy stored in the wire.
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DC PANDEY-ELASTICITY-Chapter Exercise
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  2. A force of 200 N is applied at one end of a wire of length 2m and havi...

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  3. When a steel wire fixed at one end is pulled by a constant force F at ...

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  7. A steal wire of cross-section area 3xx10^(-6) m^(2) can withstand a m...

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  8. The load versus elongation graph for four wires of the same material i...

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  9. Two wires of the same material and length but diameters in the ratio 1...

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  10. A stress of 10^(6) N//m^(2) is required for breaking a material. If t...

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  11. A cable is replaced by another cable of the same length and material b...

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  12. A uniform steel rod of cross- sectional area A and L is suspended so t...

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  13. A rubber pipe of density 1.5 xx 10^(3) N//m^(2) and Young's modulus 5 ...

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  14. In the given Fig. 7(CF).2, if the dimensions of the two wires are the ...

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  15. The stress versus strain graphs for wires of two materials A and B are...

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  17. The following four wires are made of same material. Which of these wil...

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  18. A copper wire (Y=10^(11) Nm^(-2)) of length 8 m and a steel wire (Y=2x...

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