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a selenoid of 50 turns/cm carries a current of 2.0 amps suppose a proton is fired...

a selenoid of 50 turns/cm carries a current of 2.0 amps suppose a proton is fired straight down the axis of the selenoid with a speed of 2.0x10-6 m/s. What force does the proton field?

I do not understand if the velocity of the proton and magnetic field make an angle what formula to used? show work and please explain

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