a particle moves from left to right in the presence of a uniform electric field

Question

a particle moves from left to right in the presence of a uniform electric field directed towards the top of the page. determine the type of charge and the direction of a uniform magnetic field that could result in zero net force on the particle.

I. positive charge and magnetic field directed out of the page

II. positive charge and magnetic field directed into the page

III. an uncharged particle and magnetic field directed into the page

A) I only

B) II only

C) III only

D) I and III only

E) I and II only

Explanation / Answer

. positive charge and magnetic field directed out of the page

so then I only

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