JEE Main 2021 — Electrostatics Question with Solution
From: JEE Main 2021 (Online) 18th March Morning Shift
Question
An oil drop of radius 2 mm with a density 3g cm3 is held stationary under a constant electric field 3.55 105 V m1 in the Millikan's oil drop experiment. What is the number of excess electrons that the oil drop will possess? (consider g = 9.81 m/s2)
Choose an option
Show full solutionCorrect option: B
Correct answer
B1.73 1010
Step-by-step explanation
Fe = qE = (ne)E
Fe = mg
(ne)E = mg
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This is a previous-year question from JEE Main 2021, covering the Electrostatics 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.