JEE Main 2022 — Electromagnetic Waves Question with Solution
From: JEE Main 2022 (Online) 28th June Morning Shift
Question
A radar sends an electromagnetic signal of electric field (E0) = 2.25 V/m and magnetic field (B0) = 1.5 108 T which strikes a target on line of sight at a distance of 3 km in a medium. After that, a part of signal (echo) reflects back towards the radar with same velocity and by same path. If the signal was transmitted at time t = 0 from radar, then after how much time echo will reach to the radar?
Choose an option
Show full solutionCorrect option: B
Step-by-step explanation
E0 = 2.25 V/m
B0 = 1.5 108 T
m/s
Refractive index = 2
Distance to be travelled = 6 km
Time taken s
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