Em Waves Question 110
Question: The average electric field of electromagnetic waves in certain region of free space is $ 9\times {{10}^{-4}}N{{C}^{-1}} $ . Then the average magnetic field in the same region is of the order of
Options:
A) $ 27\times {{10}^{-4}}T $
B) $ 3\times {{10}^{-12}}T $
C) $ ( \frac{1}{3} )\times {{10}^{-12}}T $
D) $ 3\times {{10}^{-12}}T $
Show Answer
Answer:
Correct Answer: B
Solution:
[b] For electromagnetic waves we know that, $ \frac{E}{B}=c $
$ \
Therefore \frac{9\times {{10}^{-4}}}{B}=3\times 10^{8},m{{s}^{-1}} $
$ \Rightarrow B=3\times {{10}^{-12}}T. $
BETA
