JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 3 August 2021, Shift 2, Physics Q26

Question 26 of 90 in this shift, Physics question 26 of 30, Section B.

Two particles of equal mass 'm' go round a circle of radius

R

under the action of their mutual gravitational attraction. The speed of each particle is

\sqrt{\frac{1}{x}\cdot\frac{Gm}{R}}

where

x

\underline{\hspace{2em}}

Official answer

NTA final key.

Chapter: Gravitation
Topic: Orbital Mechanics
Idea tested: Binary Star Systems

Same topic in other shifts

All Orbital Mechanics questions

2 Apr 2026, Shift 1 · Q30A planet ( $P_1$ ) is moving around the star of mass $2M$ in the orbit of radius $R$ . Another planet ( $P_2$ ) is moving around another star…EasySingle correct
2 Apr 2025, Shift 2 · Q47A satellite of mass 1000 kg is launched to revolve around the earth in an orbit at a height of 270 km from the earth's surface. Kinetic…MediumNumerical value
7 Apr 2025, Shift 2 · Q31Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The radius…EasyAssertion–reason
8 Apr 2024, Shift 1 · Q38Two planets A and B having masses $m_1$ and $m_2$ move around the sun in circular orbits of $r_1$ and $r_2$ radii respectively. If angular…HardSingle correct
9 Apr 2024, Shift 1 · Q36An astronaut takes a ball of mass m from earth to space. He throws the ball into a circular orbit about earth at an altitude of $318.5$ …MediumSingle correct
9 Apr 2024, Shift 2 · Q38A satellite of $10^3$ kg mass is revolving in circular orbit of radius $2R$ . If $\frac{10^4R}{6}$ J energy is supplied to the satellite,…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.