The gure below shows three small, positively charged spheres at three corners of a rectangle. The particle at upper left has a charge q1 = 3.00 nC, the one at the lower left has a charge of q2 = 8.00 nC, and the one at lower right has a charge q3 = 6.00 nC. The rectangle's horizontal side hasy'length x = 7.00 cm and its vertical side has length y = 3.50 cm. (11 - . @ l | - ll (3) What is the electric potential (in V) at the upper-right corner of the rectangle? (Assume the zero of electric potential fl is at innity.) : 3.1053 3' What is the electric potential at a point due to a single charged particle? Given more than one charged parIticle, how do you nd the total potential at a point? How far is each charge from upper right point? Be careful with Units and signs. V (b) What would be the potential (in V) at the upper-right corner if the charge q2 at lower left was 8.00 nC instead? 2070 3.: Use the same method as used in part (a). Note 172 is now the opposite sign. How does this affect the potential due to '72? Be careful with units and signs. V l