A proton beam passes without deviation through a region of space where there are uniform transverse mutually perpendicular electric and magnetic field with E=120kVm and B=50 mT. Then, the beam strikes a grounded target. Find the force imparted by the beam on the target (in μN) if the beam current is equal to I=0.80mA. Take mass of proton as 1.67×10-27kg.