Physics

A proton travelling 1.5x10^6 m/s enters 2 vertically charged parallel plates held 0.15m apart. The top plate is held at +250V and the bottom is grounded (0V). A magnetic field can be applied to the area between the plates to counteract the electric force acting on the proton. Determine the magnitude and direction of the magnetic field necessary to keep the proton travelling in a straight line.

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