Three charges, q1, q2, and q3, are all initially infinitely far apart, and will

Question

Three charges, q1, q2, and q3, are all initially infinitely far apart, and will be brought one at a time to the corners of an equilateral triangle with side length of 5.0 m.

(a) Find the work done to bring the first particle, q1 = 6.0 pC, to P from infinity.

(b) Find the work done to bring the second particle, q2 = 7.0 pC, to Q from infinity.

(c) Find the work done to bring the last particle, q3 = 4.0 pC, to R from infinity.

(d) Find the total potential energy stored in the final configuration of q1, q2, and q3.

Explanation / Answer

a) the work done to bring the first particle, q1 = 6.0 pC, to P from infinity=0.

b)the work done to bring the second particle, q2 = 7.0 pC, to Q from infinity=kq1q2/l=7.56*10-14J

c)the work done to bring the last particle, q3 = 4.0 pC, to R from infinity=kq1q3/l+kq2q3/l=9.36*10-14J

d)the total potential energy stored in the final configuration of q1, q2, and q3= total work done to assemble the system=7.56*10-14J+9.36*10-14J=1.692*10-13J

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