Physics

Problem

A flat coil of

20

turns and radius

10\,\text{cm}

is required to produce a magnetic field of

3.14 \times 10^{-4}\,\text{T}

at its centre. Calculate the current that must flow through the coil. (

\mu_0 = 4\pi \times 10^{-7}\,\text{T m A}^{-1}

) a)

1.25\,\text{A}

2.5\,\text{A}

0.25\,\text{A}

25\,\text{A}