In the corners A and B of an equilateral triangle of three meters on each side there are two charges of 4µC each. The electric potential at point C of the triangle is
19.2 kV 

b. 
24.2 kV 

c. 
7.3 kV 

d. 
12 kV 
Given the two charges are qA = 4C, qB = 4C and the side of the equilateral triangle is r = 3m. The electric potential at C due to A is given by,
The electric potential at C due to B is given by,
The total potential at C is given by,
So the total potential at C is 24.2kV.
Option (b) is the correct answer.
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