Exam 24: Alternating-Current Circuits

A series circuit contains an 80-μF capacitor,a 0.020-H inductor,and a switch.The resistance of the circuit is negligible.Initially,the switch is open,the capacitor voltage is 50 V,and the current in the inductor is zero.At time t = 0 s,the switch is closed.How long after closing the switch does the magnetic energy in the inductor first reach its maximum value?

A series circuit contains an 80-μF capacitor,a 0.020-H inductor,and a switch.The resistance of the circuit is negligible.Initially,the switch is open,the capacitor voltage is 50 V,and the current in the inductor is zero.At time t = 0 s,the switch is closed.When the potential across the capacitor is 30 V,what is the rate of change of the current?

At what frequency will a 20.0-mH inductor have an inductive reactance of 100 Ω?

What is the resonance frequency of a series ac circuit consisting of a 40.0 μF capacitor,a 55-Ω resistor,and a 0.030 H inductor?

Which of the following statements is true for a series RLC ac circuit in resonance? (There could be more than one correct choice).

A 120-V rms voltage at 1000 Hz is applied to an inductor,a 2.00-μF capacitor and a 100-Ω resistor.If the rms value of the current in this circuit is 0.680 A,what is the inductance of the inductor?

A resistance of 55 Ω,a capacitor of capacitive reactance 30 Ω,and an inductor of inductive reactance 30 Ω are connected in series to a 110-V rms 60-Hz power source.What rms current flows in this circuit?

A 120-V rms signal at 60.0 Hz is applied across a series combination of a 30.0-mH inductor and a 100-Ω resistor.What is the rms value of the voltage across the inductor?

An ac circuit has a 100-Ω resistor in series with a 4.9-μF capacitor and a 700-mH inductor.At what frequency does the circuit act like a pure resistance?

The figure shows a series ac circuit.The inductor has a reactance of 50 Ω and an inductance of 220 mH.An 80-Ω resistor and a capacitor whose reactance is 160 Ω are also in the circuit,and the rms current in the circuit is 2.2 A.What is the voltage amplitude across the capacitor?

At what frequency does a 10-μF capacitor have a reactance of 1200 Ω?

In a RLC circuit,the values of the inductance and capacitance are both halved.As a result of this change,the resonance frequency of the circuit is