Em Waves Question 146
Question: The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field strength is
Options:
A) $ 3V/m $
B) $ 6V/m $
C) $ 9V/m $
D) $ 12V/m $
Show Answer
Answer:
Correct Answer: B
Solution:
[b] From question, $ B _{0}=20nT=20\times {{10}^{-9}}T $ ( $ \because $ velocity of light in vacuum $ C=3\times 10^{8}m{{s}^{-1}} $ ) $ \vec{E}=\vec{B}\times \vec{C} $
$ |{{\vec{E}} _{0}}|,=,|\vec{B}|\cdot |\vec{C}|=20\times {{10}^{-9}}\times 3\times 10^{8}=6V/m. $
BETA
