Proton Beam Hitting Its Target

A non-relativistic proton beam passes without deflection through a region where there are two transverse, mutually perpendicular, electric (\( E=120 ~\textrm{kV/m}\)) and magnetic (\( B=50 ~\textrm{mT}\)) 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 \( I=0.8 ~ \textrm{mA} \).

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

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