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 are half way between the lower two charges. (Give ALL correct answers, i.e., B, AC, BCD...) A) The electric field at a is zero. B) The electric potential at d is zero. C) The electric field at c is zero. D) The electric potential at c is zero. E) The electric potential at b is zero. F) The electric field at d is zero. G) The electric potential at a is zero. H) The electric field at b is zero.

Explanation / Answer

A, D, E, G Following false: B) net work to bring + charge from infinity C) E fields directed from + to - F) fields go from + to - H) fields go from + to - (lower field stronger than upper fields)

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