Question

In the diagram below four equal positive charges are held in place on the corners of a square. The sides of the square have length 2L. Rank the magnitude of the electric field at the four locations (A, B, C, D) from least to greatest.

In the diagram below four equal positive charges are held in place on the corners of a square. The sides of the square have length 2L. Rank the magnitude of the electric field at the four locations (A, B, C, D) from least to greatest.

Answer 1

since all charges are positive and equal and A,B,C are similar pts. hence magnitude of the pts are equal. though the direction of the field will be diff.

since D is the center of the square. E at D =0.

so A=B=C>D.

Answer 2

D < A = B = C

Answer 3

Electric fiels at the three locations A,B and C is same.For D,it is the least.Draw vector lines for field from the charges and calculae a rough vector sum.(sum with directions).You will get the answer.

Answer 4

D < A = B = C