The acceleration of an electron due to this field component

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The electrons in the beam of a television tube have a kineticenergy of 2.04 x 10-15 J. Initially, the electrons movehorizontally from west to east. The vertical component of theearth's magnetic field points down, toward the surface of theearth, and has a magnitude of 2.92 x 10-5 T. What is the acceleration of an electron due to this field component?

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