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  • A point charge + Q is placed at the centroid of an equilateral triangle. When a second charge + Q is placed at a vertex of the triangle, the magnitude of the electrostatic force on the central char

A point charge + Q is placed at the centroid of an equilateral triangle. When a second charge + Q is placed at a vertex of the triangle, the magnitude of the electrostatic force on the central charge is 8 N.  The magnitude of the net force on the central charge when a third charge + Q is placed at another vertex of the triangle is: (please give your answer in Newton (N))

Option: 1 0

Option: 2 4

Option: 3 6

Option: 4 8

Answers (1)

best_answer

As we have learnt in

 

Magnitude of the Resultant force -

F_{net}=\sqrt{F_{1}^{2}+F_{2}^{2}+2F_{1}F_{2}\cos \Theta }

- wherein

 

 

R=\sqrt{8^{2}+8^{2}+2.8.8 cos120^{\circ}}=8N

Posted by

Divya Prakash Singh

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