A charged particle moves through a region of space containing both electric and magnetic fields. The velocity of the particle is v = (3.3 x 10^3 m/s) x + (2.7 x 10^3 m/s) y and the magnetic field is B = (0.81 T) z. Find the electric field vector E necessary to yield zero net force on the particle.(adsbygoogle = window.adsbygoogle || []).push({});

Relevant equations: F = qV x B (magnetic force)

I know you should probably use cross products for this problem, but I'm unsure of how to use that method in the context of this problem. They're talking about zero net force, so first I tried to find the magnetic force using F = qV x B and got 2673 x + 2187 y. I'm guessing the electric force should cancel this out. I'm stuck on how to proceed from here, and I don't think I even started the problem correctly. Any help would be greatly appreciated!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Using Cross Products To Find Electric Field Vector

**Physics Forums | Science Articles, Homework Help, Discussion**