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## 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=F

*magnetic*/qV, I wasn't sure how to use this to find radius.