For EM wave prorogating along x-axis, $E_{max}= 30 \, Vm^{-1}$ . What is maximum value of magnetic field ?
Answer & explanation
Correct answer: option 1
The amplitude of the electric and magnetic fields in free space are related by $\frac{E_0}{B_0}= c$
Here, $E_0 = 30 Vm^{-1}, c = 3 × 10^8 ms^{-1}$
$∴ B_0 =\frac{E_0}{c}=\frac{30}{3×10^8}= 10^{-7} T$