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A proton is traveling with an initial velocity of (7 x 10^4) m/s in the "i...

A proton is traveling with an initial velocity of (7 x 10^4) m/s in the "i hat" direction and is subject to the gravitational force of the earth. What is the magnitude and direction of the magnetic field needed to keep the proton moving in the x direction if it enters a region of uniform magnetic field.

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