Four charges are arranged at the corners of a square as shown in the figure. Q 1

Question

Four charges are arranged at the corners of a square as shown in the figure. Q1is at (-L/2,L/2), Q2is 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? Select true or false for each statement.

1.The E field at c is perpendicular to the x axis.
2.The potential at a is greater(more positive) than the potential at c.
3.The potential at b is greater(more positive) than the potential at a.
4.The E field at b is zero.
5.The E field at a is zero.
6.The potential at b is zero.
7.The potential at c is zero

Explanation / Answer

1. True, Resultant Electric Field at c due to the 4 charges in -y direction 2. False, Potential at a & c is 0 V as it is a scalar quantity 3.False , Potential at b is 0 V as it is a scalar quantity 4.False, Electric field at b due to 4 charges in -y direction 5.True, as it is a scalar quantity 6.True, as it is a scalar quantity 7.True, as it is a scalar quantity

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