Question

Four point charges of $+3\mu C,+2\mu C,+3\mu C$ and $+2\mu C$ are placed at the corners of a rectangle $A,B,C$ and $D$ . The electrical force will be least between the charges

• A. $A$ and $D$
• B. $B$ and $D$
• C. $A$ and $C$
• D. $C$ and $D$

Answer 1

Answer: (B)

Electrical force between two charges is given by $F=\frac{k{q}_1{q}_2}{r^2}$
Force will be least if the value $q_1{q}_2$ is small and separation between the two is large
For rectangle, $AD=BC;AB=CD;AC=BD$
Also, $AC>AD$ and $AC>AB$
$\therefore$ Electrostatic force will be least between the charges $B$ and $D$