Two coils are placed near each other. When the current in one coil is changed at the rate of \(5\mathrm{A}/\mathrm{s}\),…

Two coils are placed near each other. When the current in one coil is changed at the rate of \(5\mathrm{A}/\mathrm{s}\), an emf of 2 mV is induced in the other. The mutual inductance of the two coils is