JEE Main 2020 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 4 September 2020, Shift 2, Physics Q6

Question 6 of 75 in this shift, Physics question 6 of 25.

A body is moving in a low circular orbit about a planet of mass M and radius R. The radius of the orbit can be taken to be R itself. Then the ratio of the speed of this body in the orbit to the escape velocity from the planet is :

(1)1
(2) $\sqrt{2}$
(3) $\frac{1}{\sqrt{2}}$ Official answer
(4)2

Official answer

Option 3

NTA final key (Sep 2020).

Chapter: Gravitation
Topic: Orbital Mechanics
Idea tested: Orbital Velocity

Same idea in other shifts

Asked 6× in all

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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 108 of the 174 JEE Main shifts held from 2017 to 2026.