A particle moves along a circle in a region of uniform magnetic field with a mag

Question

A particle moves along a circle in a region of uniform magnetic field with a magnitude B. The particle is either a proton or an electron (you must decide which based on the figure). It experiences a magnetic force of magnitude F. (Use any variable or symbol stated above along with the following as necessary: e for the charge of an electron and the charge of a proton, me for the mass of an electron, and mp for the mass of a proton.)

What is the formula for theradius of the circle?
r =

It is not (me*v)/(e*B)!

Explanation / Answer

By Right hand rule, it is clear that charge is proton.

Now:

eVB=mp*V^2/r

r=(mp*v)/(e*B)

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