Problem

A proton beam passes without deviation through a region of space where there are uniform transverse mutually perpendicular electric and magnetic fields with

E = 120 \frac{\text{kV}}{\text{m}}

and

B = 50 \text{ mT}

. Then, the beam strikes a grounded target. Find the force imparted by the beam on the target if the beam current is equal to

I = 0.80 \text{ mA}

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