D1-SCT48: THREE CHARGES IN A LINE-ELECTRIC FIELD Shown are two cases where three

Question

D1-SCT48: THREE CHARGES IN A LINE-ELECTRIC FIELD Shown are two cases where three charges are placed in a row. Three students are comparing the electric field that exerts a force on the middle charge in the diagrams. Adrianna: "All three charges contribute by the principle of superposition. So the -3 mC +6 mC -3 mC field is going to be greatest in case A since the contributions due to the three charges will be greatest." Brandon: “I think it's a bogus question. Thefield at that point is undefined because there is a charge there." Case B Catalina:" I don't think that's right. The field that exerts a force on the middle charge is the field due to the other two charges because a charge cannot feel it own field. Since those other two charges don't change, the field acting on the middle charge is the same in both cases." With which of these students do you agree? Adrianna Explain your reasoning. Brandon Catalina None of them

Explanation / Answer

Catalina is correct.

Reason,

The statement is totally correct as a point charge can not feel any field due to its own charge.

Now, It will be same for both the cases as the charge kept on both sides are equal so it will cancel out each other's field and net electric field will be zero.

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