a wire of length L and radius R is fixed at one end and a force f is applied to the other end Producers and extension I the extension produced is another wire of the same material of 2 l length and radius 2r by a force 4F is

a wire of length L and radius R is fixed at one end and a force f is applied to the other end Producers and extension I the extension produced is another wire of the same material of 2 l length and radius 2r by a force 4F is