A point charges 2nC is located at orgin . What is the potential at (1, 0, 0)?
Correct answer: D. 18 V
- A. 12 V
- B. 14 V
- C. 16 V
- D. 18 V
Explanation
The electric potential V due to a point charge is calculated using the formula V = kq / r. Given:k (Coulomb's constant) = 9 x 109 Nm2C-2q (charge) = 2nC = 2 x 10-9 Cr (distance) = 1 m (distance from the origin to the point (1, 0, 0))Substituting these values into the formula results in V = (9 x 109) x (2 x 10-9) / 1 = 18 V.Options A, B, and C are incorrect because they involve errors in calculation or substitution of values into the formula.
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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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