JEE Main 2019 — Gravitation Question with Solution
From: JEE Main 2019 (Online) 12th January Morning Slot
Question
A straight rod of length L extends from x = a to x = L + a. The gravitational force it exerts on a point mass 'm' at x = 0, if the mass per unit length of the rod is A + Bx2 , is given by :
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
dm = (A + Bx2)dx
dF =
F = (A + Bx2)dx
= GM
= GM
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This is a previous-year question from JEE Main 2019, covering the Gravitation chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.