Question

The potential energy of interaction between the semi-circular ring of mass $M$ and radius $R$, and the particle of mass $M$ placed at the centre of curvature of the semi circular arc is

• A. $-\frac{GM^2}{R}$
• B. $-\frac{2GM^2}{R}$
• C. $-\frac{GM^2}{\pi R}$
• D. none of these

Answer 1

Answer: (A)

$v = -\frac{GMM}{R} $
$ = - \frac{GM^2}{R}$