A Charged Particle of Mass 0 $4.0 - T$ Magnetic Field Which Acts at a Right Angle to Its

Multiple Choice

A charged particle of mass 0.0040 kg is subjected to a $4.0 - T$ magnetic field which acts at a right angle to its motion. If the particle moves in a circle of radius $0.10 \mathrm {~m}$ at a speed of $2.0 \mathrm {~m} / \mathrm { s } \text {, }$ what is the magnitude of the charge on the particle?

A) 0.020 C
B) 50 C
C) 0.00040 C
D) 2500 C