(c) 4. The figure at right shows four possible directions for the velocity vector v of a negatively charged particle. The particle is moving through a uniform electric field B that is into the page and a uniform magnetic field to the left. Of all four directions, which might result in a net force of zero on the particle? (d) (b) a. Down b. Right c. Up d. Left e. None of the above X V V E (a)