SP212/3321&5521 Chapter 30 - Worksheet #3 Question 1: (Checkpoint 30-6) The figure shows three circuits with identical batteries, inductors, and resistors. Rank the circuits according to the current through the battery (a) just after the switch is closed and (b) a long time later, greatest first. Question 2: A series RL circuit is shown below. The switch is closed at time t=0. (a) How much current is flowing through the circuit at time t=3.0 ms? (b) What is the magnitude of the induced emf across the inductor at time t=3.0 ms? (c) How much potential energy is stored in the inductor at time t=3.0 ms? 5.0 Ω + 10.0 V 2.5 mH − SP212/3321&5521 Chapter 30 - Worksheet #3 Question 3: The switch in the series RL circuit below, with R=0.174 Ω, is closed at time t=0. The current builds up to 75% of its maximum value at t=4.00 s What is L in this circuit? 0.174 Ω L E Question 4: A solenoid wrapped with N =450 turns is 0.150 m long and has a cross-sectional area of 8.50×10−4 m2 . A current of 3.25 A flows through the solenoid. (a) How much potential energy is stored in the solenoid? (b) What is the energy density of the magnetic field inside the solenoid?