Question Detail
Question
Three charges +1mC, -1mC, -1mC at vertices of equilateral triangle side 2cm. Field direction at center?
Correct Answer
Option A is the correct answer.
Detailed Explanation
By symmetry, the two -1mC produce field towards themselves. The +1mC produces field away. Net field points towards side opposite the positive charge, which is side AB.
Hint
Vector sum of fields.