An electron moves horizontally to the right with speed v and enters a uniform vertical electric field of magnitude E0 pointing upwards. In the absence of any other forces, the electron would be deflected vertically by the electric force. Determine the magnitude and direction of a magnetic field that could cancel this force and allow the electron to maintain its horizontal path.

An electron moves horizontally to the right with speed v and enters a uniform vertical electric field of magnitude E0 pointing upwards. In the absence of any other forces, the electron would be deflected vertically by the electric force. Determine the magnitude and direction of a magnetic field that could cancel this force and allow the electron to maintain its horizontal path.

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