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

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| ϵ | = d ϕ d t = 20 t + 20 mV | i | = | ϵ | R = 10 t + 10 mA At t = 5 | i | = 60 mA

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