2. The flux in the core of a single-phase transformer varies with time in a sinusoidal form as shown in the below figure. The primary coil has 400 turns and the secondary coil has 100 turns. Answer the below questions. Neglect any leakage inductance or winding resistances. (Wb) f 0.005 in -0.005 0 1/60 2/60 3/60 4/60 5/60 6/60 Time (s) (a) (7 points) Express the flux (4) in time domain equation form.