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20.3 Magnetic Force on a Moving Charge A proton with initial kinetic energy E is moving in circular motion in a uniform magnetic field. When

20.3 Magnetic Force on a Moving Charge A proton with initial kinetic energy E is moving in circular motion in a uniform magnetic field. When it has completed one fourth of a revolution, what is its kinetic energy? Select one: a. 0.71 E b. The value is not given. c. E d. 1.4 E

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