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87. A force F is applied on the wire of radius r and length L and change in the length of wire is l. If the same force F is applied on the wire of the same material and radius 2r and length 2L, Then the change in length of the other wire is

(a)   l                                                (b)   2l

(c)   l/2                                           (d)   4l

Answer-c

(10)

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