187. The equation of electric current passing through a coil in SI units is $I = 2\sqrt{2}\sin 300t$. If the maximum energy stored in the coil is $0.8$ joules, what is the equation of the self-induced EMF of the coil in SI units?
[1)] $\varepsilon = 120\sqrt{2}\cos(300t - \pi)$
[2)] $\varepsilon = 120\sqrt{2}\sin(300t - \pi)$
[3)] $\varepsilon = 120\sin 300t$
[4)] $\varepsilon = 120\cos 300t$
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\textbf{187.} The equation of electric current passing through a coil in SI units is $I = 2\sqrt{2}\sin 300t$. If the maximum energy stored in the coil is $0.8$ joules, what is the equation of the self-induced EMF of the coil in SI units?
\begin{itemize}
\item[1)] $\varepsilon = 120\sqrt{2}\cos(300t - \pi)$
\item[2)] $\varepsilon = 120\sqrt{2}\sin(300t - \pi)$
\item[3)] $\varepsilon = 120\sin 300t$
\item[4)] $\varepsilon = 120\cos 300t$
\end{itemize}
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