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Electric Charges and Fields
Question
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Consider three charges q1 q2, q3, each equal to q at the vertices of an equilateral triangle of side l. What is the force on a charge Q (with the same sign as q) placed at the centroid of the triangle, as shown in the figure on the next page?

Answer

In the given equilateral triangle ABC of sides of length l, if we draw a perpendicular AD to the side BC,
then we will have,
  
   

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Some More Questions From Electric Charges and Fields Chapter

Figure shows tracks of three charged particles in a uniform electrostatic field. Give the signs of the three charges. Which particle has the highest charge to mass ratio?