The figure below shows three charges at the corners of a rectangle of length x =

Question

The figure below shows three charges at the corners of a rectangle of length x = 0.55 m and height y = 0.35 m. What is the electric potential at the center of the rectangle?

I used the following formula V = (K*q)/r

so i first caluclated r and i assumed that r was half of the diagonal .....so i got r = .3259

then i added all the charges

then i applied the formula.......(k/r) * (q1+ q2+ q3 ) = 184820.4971 but it was wrong

My answer was this and it was wrong : 184820.4971 V

ANS : ___________________ V

Explanation / Answer

V = (k/r)*(q1+q2+q3)

V = (9e9/0.3259)*(2.7-3.3-6.1)*1e-6

V = -185026.08 V

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