How many turns of wire are there in a solenoid if a 500mA current through it produces a total flux of 8 x 10-4 weber in a magnetic circuit of whose reluctance is 5 x 105 At/Wb?

The current in the RL circuit shown below reaches one-fourth its maximum value in 2.75 ms after the switch s, is thrown. R (a) Determine the time constant of the circuit (in ms). ms (b) Determine the resistance of the circuit (in 0) if L = 200 mH.

A circuit consists of 18 volts battery, a 72 mH inductor and two 50 ohms resistors connected in parallel. a) Find the characteristic time constant for the circuit. b) What is the current in the circuit at two characteristic time intervals after the switch is closed? c) A long-time-interval after the switch is closed L R R ww