Two identical positively-charged particles are moving in circles within a uniform magnetic field. Particle A has a radius that is one-half that of particle B. Which one of the following statements concerning these particles is true?
a. Both the velocity of particle A and its frequency are smaller than those of particle B.
b. Both the velocity of particle A and its frequency are larger than those of particle B.
c. The velocity of particle A is smaller than that of particle B, but they both have the same frequency.
d. The velocity of particle A is larger than that of particle B, but its frequency is smaller than that of particle B.
e. The velocity of particle A is smaller than that of particle B, but its frequency is larger than that of particle B.