A point particle has a charge equal to +1.90 ? C and is fixed at the origin. (a)

Question

A point particle has a charge equal to +1.90 ?C and is fixed at the origin. (a) What is the electric potentialV at a point 4.70 m from the origin assuming that V = 0 at infinity?
1      kV                    

(b) How much work must be done to bring a second point particle that has a charge of +3.50 ?C from the infinity to a distance of 4.70 m from the +1.90-?C charge?
(a) What is the electric potentialV at a point 4.70 m from the origin assuming that V = 0 at infinity?
1      kV                    

(b) How much work must be done to bring a second point particle that has a charge of +3.50 ?C from the infinity to a distance of 4.70 m from the +1.90-?C charge?

Explanation / Answer

a) V = k Q/r = 9E9*1.9E-6/4.7=3.64 kV

b) W = q dV = 3.5E-6*3.64E3=0.01274 J

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