A Physicist Claims That She Has Found a New Particle

Multiple Choice

A physicist claims that she has found a new particle with a mass 200 000 times the mass of the proton (1.67 * 10 ^{- 27} kg) and a charge of 3.20 *10 ^{- 19} C.If she is correct,such a particle traveling in a circle in a uniform 5.00 T magnetic field at a velocity of 2 500 m/s will have a radius of

A) 0.261 m.
B) 0.522 m.
C) 1.04 m.
D) 3.27 m.
E) 3.13 *10²⁶ m.