\(\mathrm{i}_{0}=\frac{\mathrm{V}}{\mathrm{R}}\)
\(=\frac{15}{0.15 \times 10^{3}}\)
\(=0.1 \,A\)
\(i=i_{0} e^{-\frac{R t}{L}}\)
\(=0.1 \times e^{-\frac{0.15 \times 10^{3} \times 10^{-3}}{0.03}}\)
\(=0.1 \times \mathrm{e}^{-5}=\frac{0.1}{150}=0.67\, \mathrm{mA}\)