JEE Main 2020 — Electromagnetic Waves Question with Solution
From: JEE Main 2020 (Online) 6th September Evening Slot
Question
For a plane electromagnetic wave, the magnetic field at a point x and time t is
= T
The instantaneous electric field corresponding to is :
(speed of light c = 3 × 108 ms–1)
= T
The instantaneous electric field corresponding to is :
(speed of light c = 3 × 108 ms–1)
Choose an option
Show full solutionCorrect option: D
Correct answer
D
Step-by-step explanation
Given,
= T
Wave is travelling along (–x) axis and is along +z axis.
We know, Magnitude of electric field
E = BC
= 1.2 10-7 sin ( 0.5 10 + 1.51011t ) 3 108
= 36 sin (0.5103x+1.51011t) V/m
Also,
Direction of
Instantaneous electric field,
= T
Wave is travelling along (–x) axis and is along +z axis.
We know, Magnitude of electric field
E = BC
= 1.2 10-7 sin ( 0.5 10 + 1.51011t ) 3 108
= 36 sin (0.5103x+1.51011t) V/m
Also,
Direction of
Instantaneous electric field,
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