The figure below shows three small, positively charged spheres at three corners of a rectangle. The particle at upper left has a charge q, = 6.00 nC, the one at the lower left has a charge of q, = 3.00 nC, and the one at lower right has a charge q, = 7.00 nC. The rectangle's horizontal side has length x = 5.50 cm and its vertical side has length y = 2.00 cm. (a) What is the electric potential (in V) at the upper-right corner of the rectangle? (Assume the zero of electric potential is at infinity.) (b) What would be the potential (in V) at the upper-right corner if the charge q, at lower left was -3.00 nC instead?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.