AP Physics C Electricity and Magnetism – 5.2 Inductance (Including  LR circuits) -MCQ Exam style question

Question

An inductor and two resistors are connected to an ideal battery, as shown in the figure above. What is the time constant for the circuit?
(A) 0.22 μs
(B) 0.33 μs
(C) 0.67 μs
(D) 1.0 μs
(E) 72 μs

Answer/Explanation

 

Question

After the switch is closed in the circuit above, the current in the circuit is given by \(i=I(1-e^{-t/\varsigma })\) where Iand \(\varsigma \)are constants.

What is the value of I ?
(A) 0
(B) 0.001 A
(C) 0.80 A
(D) 1.0 A
(E) 4.0 A

Answer/Explanation

 

Question.

After the switch is closed in the circuit above, the current in the circuit is given by \(i=I(1-e^{-t/\varsigma })\) where Iand \(\varsigma \)are constants.

What is the value of \(\varsigma \)?

(A)\(1.0\times 10^{-5}s\)
(B)\(2.5\times 10^{-4}s\)
(C) \(1.0s\)
(D)\(4.0\times 10^{-3}s\)
(E)\(1.0\times 10^{-5}s\)

Answer/Explanation

 

Question

A circuit is constructed using a battery of emf \(\varepsilon \), a resistor of resistance R, a capacitor of capacitance C, an inductor of inductance L, and three switches, as shown in the figure above. The three switches are labeled \(S_1\) ,\( S_2\) , and \(S_3 \), and they can be operated independently.

All switches are open, and there is no stored energy in the capacitor or the inductor. Switch \(S_3\) is closed. What is the current in the inductor after steady state has been reached?

(A)\(\frac{\varepsilon }{LR}\)

(B)\(\frac{\varepsilon R }{L}\)

(C)\(\frac{\varepsilon L}{R}\)

(D)\(\frac{\varepsilon }{R}\)

(E) Zero

Answer/Explanation

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