Physics

Problem

An unknown inductive coil is connected in series with a

30\,\Omega

resistor to a

220\,\text{V}

(rms) AC source. At

50\,\text{Hz}

the rms current is

4.4\,\text{A}

, whereas at

25\,\text{Hz}

it is

6.0\,\text{A}

(the supply voltage remaining unchanged). Calculate the inductance of the coil. a)

0.16\;\text{H}

0.085\;\text{H}

0.13\;\text{H}

0.32\;\text{H}