Essay
LR circuits: Consider the circuit shown in the figure. The battery has emf ε = 25 volts and negligible internal resistance. The inductance is 
and the resistances are R1 = 12 Ω and R2 = 9.0 Ω. Initially the switch S is open and no currents flow. Then the switch is closed. 
(a) What is the current in the resistor R1 just after the switch is closed?
(b) After leaving the switch closed for a very long time, it is opened again. Just after it is opened, what is the current in R1?
Correct Answer:
Verified
(a) 2.1 A ...View Answer
Unlock this answer now
Get Access to more Verified Answers free of charge
Correct Answer:
Verified
View Answer
Unlock this answer now
Get Access to more Verified Answers free of charge
Q56: LR circuits: For the circuit shown in
Q57: LR circuits: An ideal solenoid is 18.5
Q58: Lenz's law: The long straight wire in
Q59: Transformers: A transformer changes the 10,000 V
Q60: AC generator: Wire is wound on a
Q62: Motional emf: A conducting bar moves along
Q63: Motional emf: A conducting bar slides without
Q64: Faraday's law: A uniform magnetic field is
Q65: Mutual inductance: A 96-mH solenoid inductor is
Q66: Self-inductance: At what rate would the current