Force on Current-Carrying Conductor

[cocololo]

Homework Statement

A proton (q = 1.6 x 10-19C; m = 1.7 x 10-27 kg) is in a uniform 0.25 T magnetic field. The proton moves in a clockwise circle with a tangential speed of 2.8 x 105 m/s.

What is the radius of the circle?

Homework Equations

Not sure what equation to use.

The Attempt at a Solution

We had been learning about magnitude of a magnetic field, and the equation we were working with was B=Fmagnetic/qV, I wasn't sure how to use this to find radius.

 

[Sleepy_time]

Hi cocololo. Yes you can use the equation F=Bqv, which is the force due to the magnetic field which always points towards the centre of the circle so you can equate the magnetic force to the centripetal force and you should be able to workout the radius from that.

 

[cocololo]

Oh, of course! I think I was thinking way too hard about this looking for something way more complicated than it actually was. Thanks!

 

[Sleepy_time]

You're welcome. Anything else you need help with?