4d) Helical Springs A helical spring is made from a wire of 6 mm diameter and has outside diameter of 75 mm. If the permissible shear stress is 350 MPa and modulus of rigidity 84 kN/mm2, find the axial load which the spring can carry and the deflection per active turn. Given: d=6mm, Do = 75 mm, T = 350 MPa = 350; G = 84 = 84x103. N mm²' kN mm² N mm²