Ф = is the formula for finding the magnetic flux when the magnetic field intensity, the area and the angle of the magnetic field and the normal is given. What would be the correct equation if the area (A) is the unknown? 1. A=B/Фcos^-1

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) =_