The electron gun in a color TV accelerates the electrons through about 25,000 Volts. Estimate the acceleration of such an electron due to the magnetic field of the earth. Hint: In Atlanta, the Earth's magnetic field has a magnitude of about 5.2 X 10-5 T.

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  1. The force on the electron is
    F = e V B,
    where V is the velocity and e is the electron charge. Get the velocity V from the energy.

    (1/2) m V^2 = 25,000 V * e

    Divide the force F by the electron mass m to get the acceleration.

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