JEE Main 2021 — Gravitation Question with Solution
From: JEE Main 2021 (Online) 24th February Evening Shift
Question
A body weights 49N on a spring balance at the north pole. What will be its weight recorded on the same weighing machine, if it is shifted to the equator?
[Use = 9.8 ms2 and radius of earth, R = 6400 km.]
[Use = 9.8 ms2 and radius of earth, R = 6400 km.]
Choose an option
Show full solutionCorrect option: C
Correct answer
C48.83 N
Step-by-step explanation
Given, weight of body at North pole,
wp = mg = 49 N
Radius of Earth, R = 6400 km
Let weight of body at equator be we.
At equator, ge = g R2
we = mge = m(g R2)
Since, wp > we we < 49 N
Hence, above condition is satisfied by only option (b).
wp = mg = 49 N
Radius of Earth, R = 6400 km
Let weight of body at equator be we.
At equator, ge = g R2
we = mge = m(g R2)
Since, wp > we we < 49 N
Hence, above condition is satisfied by only option (b).
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Gravitation chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2021, 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.