b$)$ If an article of circular cross section is extruded in a cold feed extruder at $100C.$ It attains the final diameter of $10$ mm at the end of extrusion. Calculate the $\%$ die Swell if the diameter of the original die is $8$ mm $.$

c$)$ A composite specimen is made out of epoxy resin with uniaxially oriented continuous glass fibres $(40$ volume $\%).$ If a tensile force $150$ N is applied along the fibre direction, what will be the strain along the direction of force? Modulus of epoxy resin and glass are $80$ Mpa and $2\mathrm{.}4$ GPa $,$ respectively. Cross section of the composite specimen is $8m{m}^2.$