A wire of length $L$ and radius $r$ is clamped at one end. If its other end is pulled by a force $F$, its length increases by $l$. If the radius of the wire and the applied force both are reduced to half of their original values keeping original length constant, the increase in length will become:\\
(1) 3 times\\
(2) $\frac { 3 } { 2 }$ times\\
(3) 4 times\\
(4) 2 times