At t$=0,$ a rectangular coil of resistance R $=2$ ohms and dimensions w $=3$ cm and L $=8$ cm enters a region of constant magnetic field B $=1\mathrm{.}6$ T directed into the screen as shown. The length of the region containing the magnetic field is LB $=15$ cm$.$ The coil is observed to move at constant velocity v $=5$ cm$/$s$.$ What is the force required at time t $=0\mathrm{.}8$ sec to maintain this velocity?