A 10 mm diameter electrical conductor is covered by an insulation of 2 mm thickness. The conductivity of the insulation is 0.08 W/m-K and the convection coefficient at the insulation surface is 10 W/m2-K. Addition of further insulation of the same material will
(a) increase heat loss continuously
(b) decease heat loss continuously
(c) increase heat loss to maximum and then decrease heat loss
(d) decrease heat loss to maximum and then increase heat loss