Two coils are wound around the same cylindrical form. when the current in the first coil is decreasing at a rate of -0.245 a/s , the induced emf in the second coil has a magnitude of 1.70×10−3 v .

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_