$2($b$)$ Magnet wire is to be coated with varnish for insulation by drawing it through a circular die of

$0\mathrm{.}9mm$ diameter. The wire diameter is $0\mathrm{.}8mm$ and it is centred in the die. The varnish

$N\frac{s}{m^2})$ completely fills the space between the wire and the die for a length of $20mm.$ The wire is

drawn through the die at a speed of $50\frac{m}{s}.$ Determine the force required to pull the wire.$[1$N$]$