Question

What is the inductive reactance of a pure inductor with \[L=25.0\,\mathrm{mH}\] at \[f=50\,\mathrm{Hz}\]?

Options

• \[0.025\,\Omega\]

• \[220\,\Omega\]

• \[7.85\,\Omega\]

• \[28.0\,\Omega\]

Answer 1

Use \[X_L=2\pi fL\] with \[L=0.025\,\mathrm{H}\] and \[f=50\,\mathrm{Hz}\]. The calculation gives \[X_L=2(3.14)(50)(0.025)\approx7.85\,\Omega\].