An Electron Moves Through a Region of Crossed Electric and Magnetic

Multiple Choice

An electron moves through a region of crossed electric and magnetic fields.The electric field E = 2 300 V/m and is directed straight down.The magnetic field B = 0.95 T and is directed to the left.For what velocity v of the electron into the paper will the electric force exactly cancel the magnetic force?

A) 2 400 m/s
B) 2 200 m/s
C) 3 500 m/s
D) 4 400 m/s
E) 3 800 m/s