Proton Beam Hitting Its Target

A non-relativistic proton beam passes without deflection through a region where there are two transverse, mutually perpendicular, electric (E=120 kV/m E=120 ~\textrm{kV/m}) and magnetic (B=50 mT B=50 ~\textrm{mT}) fields. Then the beam strikes a grounded target. Find the force in Newtons with which the beam acts on the target if the beam current is I=0.8 mA I=0.8 ~ \textrm{mA} .

Assume that the collisions with the target are inelastic.
The proton's mass and charge are: mp=1.67×1027 kg m_{p}=1.67 \times 10^{-27}\textrm{ kg} e=1.6×1019C. e= 1.6 \times 10^{-19} C.

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