Question

The average peak current in a lightning strike is 15 kA. What is the magnitude of the magnetic flux density at a distance of 10 meters from the flash channel? What about 100 meters from the flash channel?

Answer 1

$B_i=\frac{\mu_0I}{2\pi r_i},$

$B_1=3\cdot 10^{-4}~T,$

$B_1=3\cdot 10^{-5}~T.$