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A long straight wire AB carries a curren...

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?

Text Solution

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Magnetic field due to the straight wire AB at a perpendicular distance d from it.
`B=(mu_(0)I)/(2pid)`
Therefore force on the proton moving with velocity .v. perpendicular to B, is
`F=qvB=(mu_(0)qvI)/(2pid)`
Direction: towards right
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