There are three charges on the edge of a rectangle and on the fourth end of rect

Question

There are three charges on the edge of a rectangle and on the fourth end of rectangle is a point charge. find the potential difference on point charge due to other three charges. q1=8*(10^-6) C, q2=2*(10^-6) C, q3=4*(10^-6) C. r1=6cm, r3=3cm, r3=6.71 cm. I calculated the V and turns out to be 2.66 * 10^6 V. What will be the work done to move a charge 8 * 10^-6 at the place of point charge to infinity? There are three charges on the edge of a rectangle and on the fourth end of rectangle is a point charge. find the potential difference on point charge due to other three charges. q1=8*(10^-6) C, q2=2*(10^-6) C, q3=4*(10^-6) C. r1=6cm, r3=3cm, r3=6.71 cm. I calculated the V and turns out to be 2.66 * 10^6 V. What will be the work done to move a charge 8 * 10^-6 at the place of point charge to infinity?

Explanation / Answer

Charge q = 8*10^-6 C Potential V = K[(q1/r1) + (q2/r2) + (q3/r3)]                    = 9*10^9*[1.333 + 0.666 + 0.5961]*10^-4                    =  2.335 *10^6 V
Work done W = qV                        = (8*10^-6)(2.335*10^6)                        =18.684 J  

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