Answer :
If the current in an inductor is doubled, then the stored energy is multiplied by the factor of four times.
Definition of current in an inductor:
The current is the charge per unit time passing through the inductor. Therefore the rate of work done by the charges against the emf, that is the rate of change of energy of the current, is given by. From the constitutive equation for the inductor,
The current, i that flows through an inductor produces a magnetic flux that is proportional to it.
The energy stored in the magnetic field of an inductor is proportional to the square of the current.
Doubling of current makes,
⇒ UB = [tex]\frac{1}{2}Li^{2}[/tex] , four times larger.
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