es with a resistor of resistance 2.0 m2 in a circuit loop. The initial current in this circuit is esoneme i of the solenoid,assuming that the magnetic field inside the solenoid due to irchoff’s loop rule for the circuit loop and derive an expression for the current i in the circuit as solenoid of radius 3.5 em and length 14 cm has 140 turns of wire. The solenoid is 2.0 A current in the solenoid) is uniform. b. Write K a function of time. What is the time constant of this circuit?