Question

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

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

Answer 1

Answer: (A)

$\nu=-\frac{G M M}{R}$
$=-\frac{G M^{2}}{R}$