Points A , B , and C are at the corners ofan equilateral triangle of side 5.00 m

Question

Points A, B, and C are at the corners ofan equilateral triangle of side 5.00 m.Equal positive charges of 9.00 µCare at A and B. (a) What is the potential at pointC?
1 kV

(b) How much work is required to bring a positive charge of 5.00µC from infinity to point C if the other charges areheld fixed?
2 J

(c) How much additional work is required to move the +5.00 µCpoint particle from point C to the midpoint of sideAB?
3 J (a) What is the potential at pointC?
1 kV

(b) How much work is required to bring a positive charge of 5.00µC from infinity to point C if the other charges areheld fixed?
2 J

(c) How much additional work is required to move the +5.00 µCpoint particle from point C to the midpoint of sideAB?
3 J

Explanation / Answer

(a) the potential at point C V3=2*k*q/r =2*9*109* 9.00 µC/5=32400 V (b) work is required W= potential energy = k*5*(2*9)/5 =0.162J (c)additional work is required W=k*2*9*5*(1/2.5 -1/5)=0.162J

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