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 travelling in a circle in a uniform 5.00 T magnetic field at a velocity of 2500 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.