Question

Two particles of equal mass ' $m$ ' move in a circle of radius ' $r$ ' under the action of their mutual gravitational attraction. The speed of each particle will be :

• A. $\sqrt{\frac{G m}{r}}$
• B. $\sqrt{\frac{G m}{4 r}}$
• C. $\sqrt{\frac{4 G m}{r}}$
• D. $\sqrt{\frac{G m}{2 r}}$

Answer 1

Answer: (B)

Correct answer is (b) $\sqrt{\frac{G m}{4 r}}$