An Electron Enters a Magnetic Field of 0

Multiple Choice

An electron enters a magnetic field of 0.75 T with a velocity perpendicular to the direction of the field.At what frequency does the electron traverse a circular path? (The mass of an electron is 9.1 × 10^-31 kg,and the charge of an electron is 1.6 × 10^-19 C. )

A) 2.1 × 10¹⁰ Hz
B) 4.8 × 10^-7 Hz
C) 2.1 × 10¹⁴ Hz
D) 4.8 × 10^-11 Hz