For a classroom demonstration, a professor built an RL circuit similar to the one shown in the figure, with e m f = 6.00 V, L = 4.20 mH, and R = 3.80 Ω. A rectangular circuit contains a battery of emf ℰ on its left side, with the positive terminal above the negative terminal. An open switch S is on the top side, an inductor L is on the right side, and a resistor R is on the bottom side.
(a) What is the inductive time constant of the circuit (in ms)?______ ms
(b) Calculate the current in the circuit (in A) 250 µs after the switch is closed. _______A
(c) What is the value of the final steady-state current (in A)? ________A
(d) After what time interval (in ms) does the current reach 80.0% of its maximum value? ________ms