A long straight wire AB carries a current I.A proton P travels with a speed v,parallel to the wire ,at a distance d from it in a direction opposite to the current as shown in the figure.what is the force experienced by the proton and what is its direction?

Magnetic field due to the wire at the distacne d is given by:B = μ0I2πd in vertically downward directionForce the protonF= qVBsin90F = evμ0I2πd in the right directionwith respect to the observer.

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