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Homework Statement
In a particular experiment, a particle of mass m and charge +q moves with speed v along the x-axis towards increasing x. Between x = 0 and x = b there is a region of uniform magnetic flied B in the y-direction. Deduce the conditions under which the particle will reach the region x>b. In the even that it does reach this region, find an expression for the angle to the x-axis at which it will enter it.
Homework Equations
The Attempt at a Solution
I\'m struggling to understand why the particle wouldn't reach the region x>b! Surely it has an x-component of velocity v which is unchanged because the B field produces a perp force (i.e. in the z-direction) so the x-position would grow as x=vt..?
What am i missing? THanks!