A beam of protons is moving in the +x direction with a speed of 12.4 km/s throug

Question

A beam of protons is moving in the +x direction with a speed of 12.4 km/s through a region in which the electric field is perpendicular to the magnetic field. The beam is not deflected in this region. A) If the magnetic field has a magnitude of 0.85 T and points in the + y direction, find the magnitude and direction of the electric field. B) Would electrons that have the same velocity as the protons be deflected by these fields? If so, in what direction would they be deflected? If not, why not?

Explanation / Answer

a) q E = q v B >>> E = v B = 12.4e3 * 0.85 = 10540 V/m b) No, electrons will not deflected. Because the above equation is independent of mass and only depends on magnetic field and speed

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