Question

How to solve Part 4c?

Sketches of electric field lines and equipotentials Sketch and answer 4 - A through 4 - D in your answer book. Consider different charge configurations as shown: 4 - A : Suppose you are a test charge and you start at some distance from the charge q = +1 below, such as at the point X. Starting at point X, what path could you move along without doing any work? i.e. which Ē. ds is always zero? Sketch it in your answer book. Describe the equipotential surface that passes through the point X. (Remember that in general you can move in three dimensions.) 4 - B: Repeat the same for point Y. Compare with the equipotential surface that passed through X. + + + + 4- C: Consider a charge configuration composed of two equal but oppositely-charged metal plates placed parallel to each other at a fixed distance. The electric field lines are shown by the arrows. What are the shapes of the equipotential surfaces? (Show surfaces both outside and between the plates.) + + 4-D : Draw at least four more equipotential surfaces for the electric dipole charge configuration shown below, which consists of a positive charge and a negative charge (one electric field line is already drawn.)

Answer 1

+ > E=0 L we know that the equipotential furfaces are always perpendicular ! to the direction of electric -field (electric (E=o) field-liken). 4 Outside the pgates, there is no electric field. so all the points are equpotentat equipotential swifaies points.