A closely wound circular coil of radius has turns.

PHYSICS · Multi-part · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism

Problem

A closely wound circular coil of radius

2.40\,\text{cm}

has

800

turns. (a) What must the current in the coil be if the magnetic field at the centre of the coil is

0.0580\,\text{T}

? (b) At what distance

x

from the centre of the coil, on its axis, is the magnetic field half its value at the centre?