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69. Two wires ‘A’ and ‘B’ of the same material have radii in the ratio 2 : 1 and lengths in the ratio 4 : 1. The ratio of the normal forces required to produce the same change in the lengths of these two wires is

(a)   1 : 1                                         (b)   2 : 1

(c)   1 : 4                                         (d)   1 : 2

Answer-a

(11)

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