Question

a. A circular coil has 120 turns of wire in air and has a diameter of 14 cm; the coil is in the same plane as in the sheet. Find the current I that must flow through the wire so that a flux density of 5000µT can be produced at its center

Answer 1

$I=\frac{2\pi Br}{\mu_0 n}=29.2~A.$