Exam 21: Alternating-Current Circuits

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

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

At t = 0.25 s, the power input is approximately

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

If you double the frequency in the circuit shown, the inductance of the inductor

Use the following figure to answer the next question. -The diagram that correctly represents the phase relationship between the current through the resistor and the voltage across the capacitor in a circuit containing an inductor L, a capacitor C, and a resistor R all connected in series is

An inductor with inductance L = 10 mH is connected to a power supply that provides a current I = 5 mA sin ωt. The maximum back EMF is

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

You connect a 250-Ω resistor, a 1.20-mH inductor, and a 1.80-μF capacitor in series across a 60.0-Hz, 120-V peak) source. The maximum current in your circuit is approximately

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

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

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 2.0 kHz is approximately

A square coil with 12 turns and side 5 cm is rotated in a uniform magnetic field of 1.2 T at an angular frequency of 90 radians per second. What is the maximum voltage induced in the coil?

How much does the maximum EMF produced by a generator a rotating coil) change if the area of the coil is doubled and the angular frequency halved?

Use the following figure to answer the next question. -The diagram that correctly represents the phase relationship between the current through the resistor and the voltage across the resistor in a circuit containing an inductor L, a capacitor C, and a resistor R all connected in series is

Which of the following statements about a capacitor that is connected to an AC voltage is true?

How much does the maximum EMF produced by a generator a rotating coil) change if the number of turns of the coil is tripled?

The power dissipated per cycle is

The 8000-turn primary of a transformer is connected to a 50-kV transmission line and the secondary has 19 turns. What is the voltage output of this transformer?

If you double the rms voltage in an AC circuit, the peak voltage