Three point charges are located at the corners of an equilateral triangle of side 20.0 cm. The charges at the base of the triangle are -4.00 nC (lower left) and -5.00 nC (lower right). The charge at the apex of the triangle is 3.00 nC.   (a) Find the magnitude and direction of the force on the charge at the apex.   (b) Find the electric field at the location of the charge at the apex of the triangle.   (c) Calculate the potential energy of the system of three charges.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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Three point charges are located at the corners of an equilateral triangle of side 20.0 cm. The charges at the base of the triangle are -4.00 nC (lower left) and -5.00 nC (lower right). The charge at the apex of the triangle is 3.00 nC.
 
(a) Find the magnitude and direction of the force on the charge at the apex.
 
(b) Find the electric field at the location of the charge at the apex of the triangle.
 
(c) Calculate the potential energy of the system of three charges.

(d) How much work was done in assembling the three charges?

(e) Find the electric potential at the apex point of the triangle (without the charge present).

(f) With the apex charge present, what is the electric potential at the centre of the triangle? 

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