A spherical drop of water carrying a charge of 27 pC has a potential of 740 V at its surface (with V = 0 at infinity). (a) What is the radius of the drop? (b) If two such drops of the same charge and radius combine to form a single spherical drop, what is the potential at the surface of the new drop? (a) Number Units (b) Number i Units

The drawing shows four point charges. The value of q is 3.2 μC, and the distance d is 0.85 m. Find the total potential at the location P. Assume that the potential of a point charge is zero at infinity. Number Units d P d

The problem: Two charges are a distance 2r apart. Determine an expression for the potential the three locations (I, II and III) that are a distance of r from each of the charges along the axis. * r The solution: -q 2r V₁ Fix any mistakes in the solution. = VII = VIII = +q k(-q) r2 r k(-q), k(q) 3k(q) + 72 (2r)² 4r² + k(q) (2r)² k(-q) k(q) + (2r)² r2 = III = 3k(q) 4r² -3k(q) 4r²

What is the excess charge on a conducting sphere of radius r = 0.14 m if the potential of the sphere is 1100 V and V = 0 at infinity?