Physics

Problem

A charged particle of mass

m

and charge

q

moves with speed

v

perpendicular to a uniform magnetic field of magnitude

B

. Which one of the following expressions gives the radius

r

of its circular path? a)

r=\dfrac{2mv}{qB}

r=\dfrac{mv}{qB}

r=\dfrac{mv}{2qB}

r=\dfrac{2\pi m v}{qB}