The potential at a point, due to a positive charge of 100µC at a distance of 9m, is:
Correct answer: B. 105 V
- A. 104 V
- B. 105 V
- C. 106 V
- D. 107 V
Explanation
To calculate the electric potential at a point due to a point charge, we use the formula: V = kQ/r, where V is the potential, k is Coulomb's constant (approximately 8.99 x 109 N·m²/C²), Q is the charge (100 µC or 100 x 10-6 C), and r is the distance (9 m).Substituting the values, we get V = (8.99 x 109 N·m²/C²) * (100 x 10-6 C) / 9 m = 105 V. Thus, the correct answer is Option B.Options A, C, and D are incorrect because they do not match the calculated value of the potential, which is 105 V.
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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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