A straight wire of length L and radius a has a cur- rent I. A particle of mass m and charge q approaches the wire moving at a velocity v in a direction anti parallel to the current. The line of motion of the particle is at a distance r from the axis of the wire. Assume that r is slightly larger than a so that the magnetic field seen by the particle is simi- lar to that caused by a long wire. Neglect end effects and assume that speed of the particle is high so that it crosses the wire quickly and suffers a small deflection theta in its path. Calculate theta.

A straight wire of length L and radius a has a cur- rent I. A particle

1.	A straight wire of length L and radius a has a cur- rent I. A particle of mass m and charge q approaches the wire moving at a velocity v in a direction anti parallel to the current. The line of motion of the particle is at a distance r from the axis of the wire. Assume that r is slightly larger than a so that the magnetic field seen by the particle is simi- lar to that caused by a long wire. Neglect end effects and assume that speed of the particle is high so that it crosses the wire quickly and suffers a small deflection theta in its path. Calculate theta.
Answer» ANSWER :`THETA=(mu_(0)ILQ)/(2pimvr)`

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