Problem 3.389

A non-relativistic proton beam passes without deviation through the region of space where there are uniform transverse \(\mathrm{mu}-\) tually perpendicular electric and magnetic fields with \(E=120 \mathrm{kV} / \mathrm{m}\) and \(B=50 \mathrm{mT}\). Then the beam strikes a grounded target. Find the force with which the beam acts on the target if the beam current is equal to \(I=0.80 \mathrm{~mA}\)