Posted by **jim** on Tuesday, March 22, 2011 at 8:52am.

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?

- College Physics II -
**drwls**, Tuesday, March 22, 2011 at 10:30am
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 = ?

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