Question

What is the magnetic field at the centre of a single circular loop of radius \(R\) carrying current \(I\)?

Options

• \(B_0=\frac{\mu_0 I}{2R^2}\)

• \(B_0=\frac{\mu_0 I R}{2}\)

• \(B_0=\frac{\mu_0 I}{2R}\)

• \(B_0=\frac{\mu_0 I}{R}\)

Answer 1

At the centre, the axial distance is \(x=0\). Substituting this into the axial field formula simplifies it to \(B_0=\frac{\mu_0 I}{2R}\).