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Q.

If one end of a wire is fixed with a rigid support and the other end is stretched by a force of 10 N, then the increase in length is 0.5 mm. The ratio of the energy stored in the wire and the work done in displacing it through 0.5 mm by the same force is:

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a

$\frac{1}{3}$

b

$\frac{1}{4}$

c

$\frac{1}{2}$

d

1

answer is C.

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Detailed Solution

Work done in stretching a wire:

$U = \frac{1}{2} Fl = \frac{1}{2} \times 10 \times 0.5 \times 10^{- 3} = 2.5 \times 10^{- 3} J$

Work done to displace it through 0.5 mm

$W = F \times l = 5 \times 10^{- 3} J$

The ratio of above two quantities = 1 : 2

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If one end of a wire is fixed with a rigid support and the other end is stretched by a force of 10 N, then the increase in length is 0.5 mm. The ratio of the energy stored in the wire and the work done in displacing it through 0.5 mm by the same force is: