Two point charges A (4 × 10⁻⁹ C) and B (-16 × 10⁻⁹ C) are separated by a distance 20 cm in vacuum. Where must another point charge be placed, so that it does not experience any net force due to charges A and B?

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: 20 cm left of A.