Question

An electron in a vacuum is first accelerated
by a voltage of 21100 V and then enters a
region in which there is a uniform magnetic
field of 0.644 T at right angles to the direction
of the electron’s motion.
The mass of the electron is 9.11 × 10−31 kg
and its charge is 1.60218 × 10−19 C.
What is the magnitude of the force on the
electron due to the magnetic field?
Answer in units of N.