$$

Question $9$

$3\mathrm{.}5$ pts

What is the force per meter on a lightning bolt at the equator that carries $20,000$A perpendicular to Earth's $3\mathrm{.}0{10}^{-5}T$ field?

$0\mathrm{.}400\frac{N}{m}$

$0\mathrm{.}500\frac{N}{m}$

$5\mathrm{.}500\frac{N}{m}$

$0\mathrm{.}600\frac{N}{m}$