Q .     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 `3A`. If length of wire `1`
increased by `Deltax` on applying force `F,` how
much force is needed ro stretch wire `2` by the
same amount?

BITSAT 2011
A

`4F`

B

`6F`

C

`9F`

D

`F`

HINT

`Y = (FL)/(ADeltaL)`
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