Question

Figure shows a system of three positive charges placed at the vertices of an equilateral triangle. To decrease the potential energy of the system,

• A. a positive charge should be placed at centroid.
• B. a negative charge should be placed at centroid.
• C. distance between the charges should be decreased.
• D. it should be rotated by an angle of $\frac{\pi}{2}$ radian.

Answer 1

Answer: (C)

Potential energy decreases whenever there is attraction. $A$ negative charge placed at centroid causes attraction