Question

The amplitude of the electric field of a plane electromagnetic wave in air is $6.0 \times 10^{-4} \,V\,m ^{-1}$. The amplitude of the magnetic field will be

• A. $1.8 \times 10^{5}\, T$
• B. $5.0 \times 10^{3} \,T$
• C. $2.0 \times 10^{-4} \,T$
• D. $2.0 \times 10^{-12} \,T$

Answer 1

Answer: (D)

$B_{0}=\frac{E_{0}}{c}=\frac{6.0 \times 10^{-4}}{3 \times 10^{8}}=2.0 \times 10^{-12}\, T$