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68. A force of 10

A force of 103 newton stretches the length of a hanging wire by 1 millimetre. The force required to stretch a wire of same material and length but having four times the diameter by 1 millimetre is

(a)   4×103   N                                       (b)  16×103  N

(c)  (1/4)×103  N                                     (d)   (1/16)×103 N

Answer-b

(2)

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