A Series LR Circuit Contains an Emf Source of 14

question 18

Multiple Choice

A series LR circuit contains an emf source of 14 V having no internal resistance, a resistor, a 34 H inductor having no appreciable resistance, and a switch. If the emf across the inductor is 80% of its maximum value 4.0 s after the switch is closed, what is the resistance of the resistor?

• A) 14 Ω
• B) 1.9 Ω
• C) 1.5 Ω
• D) 5.0 Ω

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