A −4.0 nC point charge and a +6.0 nC point charge are separated by 2.5 cm inside a…

PHYSICS · Single correct · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance

Problem

A −4.0 nC point charge and a +6.0 nC point charge are separated by 2.5 cm inside a dielectric material of relative permittivity ε_r = 2. What is the electric potential energy U of the pair? (Use k ≈ 9.0 × 10⁹ N·m²/C².) (a) +4.3 μJ+4.3\ \mu\text{J} (b) −2.2 μJ-2.2\ \mu\text{J} (c) −4.3 μJ-4.3\ \mu\text{J} (d) −8.6 μJ-8.6\ \mu\text{J}

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