A point charge is fixed in air

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

Problem

A point charge +5 μC+5\,\mu\text{C} is fixed in air. Another charge −5 μC-5\,\mu\text{C} is brought slowly from a distance of 20 cm20\,\text{cm} to 10 cm10\,\text{cm} from the fixed charge, keeping the motion quasi-static so that no kinetic energy is gained. Determine the work done by the external agent during this process. (a) +2.25 J+2.25\,\text{J} (b) −0.56 J-0.56\,\text{J} (c) −1.1 J-1.1\,\text{J} (d) +1.1 J+1.1\,\text{J}

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