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Three identical point charges are placed on the vertices of an equilateral triangle ABC as shown in the figure. Consider a median AD , where point O is the centroid. As we move form point A to point D

Options

  1. AElectric field vanishes only once at O, between points A and D.
  2. BElectric field vanishes two times, first at O and then somewhere between O & D .
  3. CElectric field vanishes two times, first at a point somewhere between A & O and then at O .
  4. DElectric field vector changes direction more than once.

Correct answer

D. Electric field vector changes direction more than once.

Step-by-step solution

E _ A = field due to charge on A ; E _ AB = field due to charges on B and C

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