Answer
$3.00\,\mu s$
Work Step by Step
$\frac{T}{4}$ time is taken to convert maximum magnetic energy to maximum electrical energy. Another $\frac{T}{4}$ time is taken to convert maximum electrical energy into maximum magnetic energy. Therefore, a total of $\frac{T}{2}$ time is taken.
We know that $\frac{T}{4}= 1.50\,\mu s$.
Therefore $\frac{T}{2}=1.50\,\mu s\times2=3.00\,\mu s$
