Question

In a plane electromagnetic wave propagating in space has an electric field of amplitude $9\times {10}^{3}V/m$, then the amplitude of the magnetic field is

• A. $2.7\times {10}^{12}T$
• B. $9.0\times {10}^{-3}T$
• C. $3.0\times {10}^{-4}T$
• D. $3.0\times {10}^{-5}T$

Answer 1

Answer: (D)

$3.0\times {10}^{-5}T$

$B_0=\frac{E_0}{c}=\frac{9\times {10}^3}{3\times {10}^8}=3.0\times {10}^{-5}T$.