Question

The amplitude of electric field in a plane electromagnetic wave in vacuum is $9\times 10^{- 3}V/m.$ The amplitude of magnetic field will be

• A. $3\times 10^{- 11}T$
• B. $3\times 10^{5}T$
• C. $\frac{1}{3}\times 10^{- 11}T$
• D. $\frac{1}{2 . 7}\times 10^{5}T$

Answer 1

Answer: (A)

$C=\frac{E}{B}$
$\Rightarrow B=\frac{E}{C}=\frac{9 \times 10^{- 3}}{3 \times 10^{8}}T$
$=3\times 10^{- 11}T$