Four charges are at the corners of a square as shown in the figure. Corners A and D have equal charge, while both B and C have a charge of +1 C. What is the charge on A so that the force on B is zero?

Question

G1 Physics · Accepted Answer

Step 1: Identify the relevant electrostatic principle—Coulomb's law, superposition, Gauss's law, potential-energy conservation or conductor boundary conditions. Step 2: Write the corresponding equation using the quantities in the question and simplify the geometry. Step 3: Substitute the given values and compare with the alternatives. Final: C: - 0.35 C.