Consider two separate systems, each with four charges of magnitude q arranged in

Question

Consider two separate systems, each with four charges of magnitude q arranged in a square of length L as shown above. Points a and c are in the center of their squares while points b and d arc half way between the lower two charges. (Give ALL correct answers, i.e., B, AC, BCD...) The electric field at c is zero. The electric field at a is zero. The electric potential at b is zero. The electric field at b is zero. The electric potential at d is zero. The electric potential at a is zero. The electric field at d is zero. The electric potential at c is zero.

Explanation / Answer

(B.) Electric field at a is zero.

   Since Both positive charges cancel electric field of each other and so do the both negative charges.

    (Symmetry )

(C.) the electric potential at b is zero.

(F.) the electric potential at a is zero.

(H.) the electric potential at c is zero .

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