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57. A wire of length L and radius r is rigidly fixed at one end. On stretching the other end of the wire with a force F, the increase in its length is l. If another wire of same material but of length 2L and radius 2r is stretched with a force of 2F, the increase in its length will be

(a)       l                                             (b)    2l

(c)      l /2                                         (d)  l /4

Answer-a

(12)

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