Two charged particles are held fixed a certain distance apart. Ifthe electric fi

Question

Two charged particles are held fixed a certain distance apart. Ifthe electric field vector is zero at some point on the line betweenthe two charges, what can we conclude about the signs of the chargeon the particles? About the magnitudes of their charges? Brieflyexplain your reasoning.
A charged particle is released from rest in a region of uniformelectric and gravitational fields. The electric field is directedperpendicular to the gravitational field, and the acceleration ofthe particle due to the electric field is comparable in magnitudeto that due to the gravitational field. Describe the trajectory ofthe particle in the combined electric and gravitational fields.

Explanation / Answer

If the electric field is zero at a point in between thetwo charges, then we say that the two charges have the samesign. Other than this case, the two charges have oppositesign.

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