Two charges −q and +q are placed at points A and B of a cube of side a. The potential energy of charge +q placed at a vertex is given by which expression? [Diagram: Image]
Physics · Electrostatic · Electric Potential & Potential Energy
AIPMT 2003 NEET Previous Year

Question

Two charges −q and +q are placed at points A and B of a cube of side a. The potential energy of charge +q placed at a vertex is given by which expression? [Diagram: Image]

G1 Physics · Accepted Answer

Step 1: Potential energy of test charge Q is U = QΣ[kqᵢ/rᵢ]. Step 2: Use the relative vertex distances shown in original cube diagram and add signed potentials. Step 3: The source answer matches option (C).