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A 0.8 C (Coulomb) charge of mass 0.2kg is moving with a speed of 20 m/s...

A 0.8 C (Coulomb) charge of mass 0.2kg is moving with a speed of 20 m/s in a circular orbit of radius r in a uniform magnetic field of magnitude 0.5 T (Tesla) directed perpendicular to the velocity of the charge.
(a) Find the radius r of the circular orbit
(b) Find the new value of the radius r if the speed of the charge is doubled (i.e., speed = 40 m/s)

(a) r = 20 m,    (b) r = 40 cm

(b) r = 22 m, (b) r = 44 m

(c) r = 10 m, (b) r = 20 m

(d) r = 40 m, (b) r = 20 m
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