Two charges +2 μC and -2 μC are placed at the corners of an equilateral triangle of side 1 m. The potential at the third corner is:
Correct answer: A. Zero
- A. Zero
- B. 3.6 × 10⁴ V
- C. -3.6 × 10⁴ V
- D. 1.8 × 10⁴ V
Explanation
Potential at the third corner is the sum of potentials due to both charges. Distance to each charge is 1 m. V = k(2 × 10⁻⁶)/1 + k(-2 × 10⁻⁶)/1 = 0, as the contributions cancel.
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Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
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