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 $10$ $W/m^2-K$. Addition of further insulation of the same material will
- increase heat loss continuously
- decrease heat loss continuously
- increase heat loss to a maximum and then decrease heat loss
- decrease heat loss to a minimum and then increase heat loss