A closely wound coil has a radius of and carries a current of

PHYSICS · Subjective · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism

Problem

A closely wound coil has a radius of

6.00\ \text{cm}

and carries a current of

2.50\ \text{A}

. How many turns must it have if, at a point on the coil axis

6.00\ \text{cm}

from the centre of the coil, the magnetic field is

6.39\times10^{-4}\ \text{T}