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प्रश्न
Two wires are made of the same material and have the same volume. However wire 1 has cross-sectional area A and wire 2 has cross-sectional area 9A. If the length of wire 1 increases by Δx on applying force F, how much force is needed to stretch wire 2 by the same amount?
पर्याय
16 F
25 F
81 F
64 F
MCQ
उत्तर
81 F
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