Please help ! I figured out the first problem however just couldn\'t get the nex

Question

Please help ! I figured out the first problem however just couldn't get the next part! he figure shows three charges q1, q2 and q3 situated at corners of a rectangle of sides a 14.0 cm and b 6.0 cm. R30.......8....... For q1 4.00 uc, q2 -4.00 uc, and q3 2.50 uc find the electric potential at the center of the rectangle 2.95x105 v You are correct. Previous Tries Continuing with the figure above, how much of the electric energy of the system would be expended in moving q3 to infinity while qu and in their positions? Anwer Incorrect. Tries 8/20 Previous Tries

Explanation / Answer

For the second part find the potential at q3 caused by the other two charges.

V = kq1/r1 + k q2/r2

Now find the distance to the centre of the rectangle.

using pythag. Theorem
C = sqrt ( a^2 + b^2)
= sqrt( 7.5 ^ 2+ 3 ^2)
= 8.0 cm ( 0.08 m)
V = kq1/r1 + k q2/r2 = k(q1+q2)/C= 9e9*(4e-6-4e-6)/0.08 =0
The energy is V q3 = 0*q3 =0

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