Exam 9: Alternating-Current Circuits

A flat, rectangular coil measuring 0.10 m by 0.20 m and containing 50 turns of wire is rotating at a constant speed of 100 $\pi$ rad/s in a magnetic field of 0.20 T. The maximum EMF induced in this coil is approximately

A 5-µF capacitor is charged to 30 V and is then connected across a 10-µH inductor. The maximum value of the energy stored in the electric field of the capacitor is

The current in the primary of a transformer is changing at the rate of 500 A/s and the EMF in the secondary is 30 V. The coefficient of mutual inductance of this transformer is

The reACtance of an inductor is 10 $\Omega$ at 1 kHz. The inductance of this inductor is

Use the following figure for the next three problems. -The power dissipated per cycle is

You connect a 100- $\Omega$ resistor, a 800-mH inductor, and a 10.0- $\mu$ F capacitor in series across a 60.0-Hz, 120-V (peak) source. The impedance of your circuit is approximately

How much does the maximum EMF produced by a generator (a rotating coil) change if the period of rotation is doubled?

The diagram that correctly represents the phase relationship between the voltage across the resistor and the voltage across the inductor in a circuit containing an inductor L, a capacitor C, and a resistor R all connected in series is

The rms value of house voltage in much of Europe is 220 V. What is the maximum voltage?

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are V_rms = 12 V, L = 5.0 mH, C = 4.0 $\mu$ F, and R = 20 $\Omega$ . Under these conditions the current

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are L = 5.0 mH, C = 4.0 $\mu$ F, R = 10 $\Omega$ . If you adjust the frequency of the oscillator so that it is at the resonance frequency of the RLC circuit, and if it supplies 3.0 V rms, what is the rms current in the circuit?

How much does the maximum EMF produced by a generator (a rotating coil) change if its magnetic field is halved?

You place a 50-mH inductor across an AC generator that has a maximum EMF of 120 V. The inductive reactance when the frequency is 60 Hz is approximately

An AC motor can be turned into an AC generator by

If you double the frequency in the circuit shown, the capacitative reactance of the circuit

A 5-µF capacitor is charged to 30 V and is then connected in series with a 10-µH inductor and a 50- $\Omega$ resistor. The potential difference across the resistor after a long time has passed will be

As the frequency in this simple AC circuit increases, the rms power dissipated by the resistor

Use the following figure for the next three problems. -At t = 0.25 s, the power input is approximately

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are L = 5.0 mH, C = 4.0 $\mu$ F, R = 10 $\Omega$ . What is the resonance frequency of the circuit?

A 10-mH inductor has a resistance of 10 $\Omega$ . Its impedance in an AC circuit is