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A proton travels through uniform magnetic and electric fields. The magnetic field is in the negative...

A proton travels through uniform magnetic and electric fields. The magnetic field is in the negative x direction and has a magnitude of 3.31 mT. At one instant the velocity of the proton is in the positive y direction and has a magnitude of 2560 m/s. At that instant, what is the magnitude of the net force acting on the proton if the electric field is (a) in the positive z direction and has a magnitude of 5.15 V/m, (b) in the negative z direction and has a magnitude of 5.15 V/m, and (c) in the positive x direction and has a magnitude of 5.15 V/m?

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