Question Detail
Question
Three charges +1mC, -1mC and -1mC are placed at the edges A, B & C respectively of an equilateral triangle of side 2cm. The direction of the field at the centre of the triangle is:
Correct Answer
Option B is the correct answer.
Detailed Explanation
The two negative charges at B and C 'pull' the field toward themselves, while the positive charge at A 'pushes' the field away from itself. By symmetry, the resultant net field at the centroid points from vertex A straight toward the midpoint of the opposite side BC.
Hint
The two negative charges at B and C 'pull' the field toward themselves, while the positive charge at A 'pushes' the field away from itself.