A proton of charge +e moves with velocity v parallel to an infinitely-long, thin wire, at a distance r from the axis of the wire. The wire carries a current I, and its charge per unit length is λ. (assumed positive and uniform). Both the proton and the wire are in vacuum. Find the magnetic field experienced by the proton. Here y is the Lorentz factor.
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Answer:
the force experienced by proton is 0