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? Enter the letters of true statements in alphabetical order; e.g. "ACF" A) a,b, and c each lie on a different equipotential surface. B) The E field at a points towards c. C) The potential at a is greater(more positive) than the potential at c. D) The magnitude of the E field at b is greater than at c. E) The E field at a is zero. F) The potential at c is zero. G) The E field at c is perpendicular to the x axis.

Explanation / Answer

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

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

At point b, the electric field is zero.FALSE

The potential at b is zero. TRUE

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

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

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

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