A metal wire of length `l` and cross-sectional area A has mass m. It is stretched by an amount .e. by a load of mass M. If the wire breaks at the point of suspension due to the load then find the rise in temperature of the wire?

Explanation

Strain energy = `1/2 F.e = 1/2 (Mg)e`
As the wire breaks strain energy stored in the wire appears in the form of heat.
` therefore 1/2 (Mg) e = ms Delta t` [s = specific heat of wire]
`Delta t = ((mg)e)/(2ms)`