Four charges are arranged at the corners of a square as shown in the figure. Q1

Question

Four charges are arranged at the corners of a square as shown in the figure. Q1 is at (-L/2,L/2), Q2 is at (L/2,L/2), point a is at the origin and Q1 = Q2 = -Q3 = -Q4. Which of the following statements correctly describe the electric field E and the potential at points a,b and c? (Give ALL correct answers, i.e., B, AC, BCD...)

A) The E field at c is zero.
B) The E field at c is parallel to the x axis.
C) a,b, and c each lie on a different equipotential surface.
D) The magnitude of the E field at b is greater than at c.
E) The potential at c is greater(more positive) than the potential at b.
F) The potential at b is zero.
G) The E field at a points towards c.

Explanation / Answer

A) The E field at c is zero. FALSE

B)At c, the electric field is parallel to the x axis.FALSE

C)The points a, b, and c each lie on a different eqiopotential surface. FALSE

D)The magnitude of the electric field at b is greater than at c TRUE

E)The potential at a is greater (more positive) than the potential at c.FALSE

F)The potential at b is zero. TRUE

G)At point a, the electric field points toward point c FALSE

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