Two wires are made of same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross- sectional area 6A. If on applying a force F, then length of first wire increases by Al, how much force is required to stretch the wire 2Al?
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Thus, the force needed to stretch the second wire by the same amount is 9F. So, the correct answer is 9F
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