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Magnetic Fields Question

Yet another question I've been attempting to do, and yet again, the wording seems to be a little questionable..

c) Name the forces acting on a charge travelling through a magnetic field and write down an expression for the force balance that is necessary to establish a circular path. Derive an expression for the radius of the path, using your expression found in a).

The expression found in a) is basically that

current density (j) = nev

n = charge density
e = charge of electron
v = velocity

force balance necessary to establish a circular path:

mv2r=qvB \frac{mv^2}{r}=qvB

Then deriving an expression for the radius of the path:

r=mvqB r=\frac{mv}{qB}

However, when they say to use the expression in a), do you think I should just find it in terms of v(velocity)
jne=v\frac{j}{ne}=v

r=mjneqB r=\frac{mj}{neqB}

Confusing question...
And finally, what just got me was naming the forces that act on a charge travelling in a magnetic field...sounds like a basic question but uh.
help? :p:
Reply 1
Avatar for TI-84
TI-84
OP
18
bump?
Reply 2
Avatar for asilcansei
asilcansei
...and I thought it was going to be a question about the band, magnetic fields...
huge disappointment
Reply 3
Avatar for teachercol
teachercol
9
e and q are basicallyy the same thing.
Reply 4
Avatar for Carlo08
Carlo08
looking at the notes the forces are centrifugal and magnetic field, with qvb being the magnetic field and the other part of the equation being the centrifugal so the equation you gave shows the are equal :smile:

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