Two point charges, one q and the other -q, form a dipole separated by a distance 2L. A third charge Q is placed midway between these two charges. If the only charge that is negative is -q, what is the force on Q? 2kge kg2 toward -q 2kg2 toward q kq2 toward q Question 8 (1.5 points) If the plane 'x'axis is an equipotential surface, in which of the following directions can the electric field be in the region immediately adjacent to this plane? must be positive 'y' direction the positive 'x' direction the negative 'x' direction can either be positive and negative 'y' directions