In the given figure the magnetic flux through the loop increases according to the relation ${\varphi }_B\left(t\right)=10t^2+20t$, where ${\varphi }_B$ is in milliwebers and $t$ is in seconds. The magnitude of current through $R=2 \mathrm{\Omega }$ resistor at $t=5 \mathrm{s}$ is _____ $\mathrm{mA}.$