A charge +q lies between a charge + Q0 on its left and an insulating, curved, ch

Question

A charge +q lies between a charge + Q0 on its left and an insulating, curved, charged rod with charge + Q0 uniformly distributed on its right. As shown, it is a distance d from both the + Q0 and all points on the curved rod. Consider the following statements made by 3 students: "The charges that are exerting forces on +q are both the same distance away, and the same charge. So from Coulomb's law, the forces have the same magnitude. Since they are in opposite directions, the net force on +q is zero." "The net electric force on +q is to the right. +q is perpendicular to the middle of the rod. Therefore, the force from the bottom half of the rod cancels the force from the top half, and you are left with a repellant horizontal force from the charge on the left." "It is only the vertical components of the forces due to the charge on the rod that cancel out. The horizontal components all act to produce a force on +q to the left. So there is still a charge +Q0, producing a horizontal force to the left, just as there is a charge +Q0 to the left of +q producing a force to the right. The net force on +q is zero." Which of these students is correct? 1 2 3 Two of them None of them

Explanation / Answer

B. 2

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