College Physics II
posted by jim .
An electric field of 2.04 kV/m and a magnetic field of 0.548 T act on a moving electron to produce no net force. If the fields are perpendicular to each other, what is the electron's speed?

Require that the magnetic and electrical forces be equal.
e*V*B = e*E
The charge, e, cancels out, so
V = (E/B)
If E is in V/m (NOT kV/m), and B is in Tesla, the answer will be in m/s.
V = 2040/0.548 = ?