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Homework Statement
Particles with charge e and mass m are emitted with velocity v from a point source. Their directions of emission make a small angle with the direction of a uniform constant flux density B. Show that the particles are focussed to a point at a distance 2pi mv/Be from their source and at integral multiples of this distance.
Homework Equations
The Attempt at a Solution
Not sure how to do this.?
Obviously we need to use the Loretnz force: F = q(v x B) but can't seem to get the result...
Help please ! :)