$($a$)$

What is the force per meter $($in N$/$m$)$ on a lightning bolt at the equator that carries $19,070$ A perpendicular to the Earth's $3\mathrm{.}00105$ T field?

N$/$m

$($b$)$

What is the direction of the force if the current is straight up and the Earth's field direction is due north, parallel to the ground?

$---$Select$---$up$$down$$north$$south$$east$$west$$The magnitude is zero.