A large negatively charged metal plate is lying horizontally, as in the picture

Question

A large negatively charged metal plate is lying horizontally, as in the picture below. A negatively charged conducting ball is located, as shown, above the plate. Points A and B are points in space, not charges. (a)Draw possible electric field lines. Explain why you drew the field lines the way you did.Is the field stronger, at point A or point B? Explain.
(b)Draw possible equipotential lines in the diagram. Explain why you drew the equipotential lines the way you did.

A large negatively charged metal plate is lying horizontally, as in the picture below. A negatively charged conducting ball is located, as shown, above the plate. Points A and B are points in space, not charges. (a)Draw possible electric field lines. Explain why you drew the field lines the way you did.Is the field stronger, at point A or point B? Explain. Draw possible equipotential lines in the diagram. Explain why you drew the equipotential lines the way you did.

Explanation / Answer

A.the field is stronger at the point A since both the fields from Plate and the point charge are in the same directions and add up , than at the point b which is a little farther. the field lines always are emitted perrpendicular to the ssurfac eof the charged surface or the charge itself. they may have different paths but ultimately, they should end up perpenicularly on the surface. B.the equipotential surfaces must be perpendicular to the field lines. as the work done by moving a charge on a equipotential surface is zero. and it contradicts the statement if field lines are not perpendicular.

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