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Bhumble
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Homework Statement
A particle of charge q enters a region of uniform magnetic field B (pointing into the page). The field deflects a particle a distance d above the original line of flight. Is the charge positive or negative? In terms of a, d, B, and q, find the momentum of the particle.
x displacement is a
y displacement is d
particle is initially moving in the x direction
Homework Equations
p = QBR
The Attempt at a Solution
Charge is +q via the right hand rule with the magnetic field pointing into the page and force initially upward.
I'm just not sure how to find the radius. I tried finding a reference somewhere so if someone knows a good place to find the trig on this that would be great.