Two wires are mode of the same mate...

Two wires are mode of the same material and have the same volume . The first wire has cross sectional area A and the second wire has cross sectional area 3A . If the length of the first wire is increased by` Delta l ` on applying a force F, how much force is needed to stretch the socond wire by the same amount ?

`4F`

`6F`

`9F`

`F`

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