JEE Main 2022 — Electromagnetic Waves Question with Solution
From: JEE Main 2022 (Online) 24th June Evening Shift
Question
An electric bulb is rated as 200 W. What will be the peak magnetic field at 4 m distance produced by the radiations coming from this bulb? Consider this bulb as a point source with 3.5% efficiency.
Choose an option
Show full solutionCorrect option: B
Correct answer
B1.71 108T
Step-by-step explanation
The total power (PT) of the light bulb is given as 200 W, but only 3.5% of this power is actually emitted as radiation, which we will call P.
So, Effective power output of the bulb
So, Effective power output of the bulb
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Electromagnetic Waves 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 2022, covering the Electromagnetic Waves 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.