\(emf\) \(=-\frac{ d \phi}{ dt }=-(16 t -9)\)
At \(t =0.25 s\)
\(Emf\) \(=-[(16 \times 0.25)-9]=5 V\)
\(Current\) \(=\frac{\text { Emf }}{\operatorname{Re} s i s \operatorname{tance}}=\frac{5 V }{20 \Omega}\)
\(=\frac{1}{4} A =\frac{1000}{4} mA =250 mA\)