The calculated time period for 0.12 v emf is 0.04 s.
The inductance of a coil refers to the electrical property the inductive coil has to oppose any change in the current flowing through it. It therefore follows that inductance is only present in an electric circuit when the current is changing. There is a source that produces emf. In contrast, voltage is just the difference in potential between any two locations in a circuit.
We are aware that emf=Li/t.
Simply enter the inductance value and the current flow rate in the calculation above.
0.12= 30(t),
= 0.04 s
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