## Questions 50-41
A particle of charge +e and mass m moves with speed v perpendicular to a uniform magnetic field B directed into the page. The path of the particle is a circle of radius r, as shown.
50. Which of the following correctly gives the direction of motion and the equation relating v and r ?
## Direction
(A) Clockwise
(B) Clockwise
(C) Counterclockwise
(D) Counterclockwise
Equation
eBr=mveBr=mv2eBr=mveBr2=mv2
