Questions from Modern Physics

Q: A sinusoidal current i = I cos ωt has an rms value

A sinusoidal current i = I cos ωt has an rms value Irms = 2.10 A. a. What is the current amplitude? b. The current is passed through a full-wave rectifier circuit. What is the rectified average curr...

Q: Radio station WCCO in Minneapolis broadcasts at a frequency of 830 kHz

Radio station WCCO in Minneapolis broadcasts at a frequency of 830 kHz. At a point some distance from the transmitter, the magnetic-field amplitude of the electromagnetic wave from WCCO is 4.82*10-11...

Q: The voltage across the terminals of an ac power supply varies with

The voltage across the terminals of an ac power supply varies with time according to Eq. (31.1). The voltage amplitude is V = 45.0 V. What are a. the root-mean-square potential difference Vrms and b...

Q: A capacitor is connected across an ac source that has voltage amplitude

A capacitor is connected across an ac source that has voltage amplitude 60.0 V and frequency 80.0 Hz. a. What is the phase angle f for the source voltage relative to the current? Does the source volt...

Q: An inductor with L = 9.50 mH is connected across

An inductor with L = 9.50 mH is connected across an ac source that has voltage amplitude 45.0 V. a. What is the phase angle ɸ for the source voltage relative to the current? Does the source voltage l...

Q: A capacitance C and an inductance L are operated at the same

A capacitance C and an inductance L are operated at the same angular frequency. a. At what angular frequency will they have the same reactance? b. If L = 5.00 mH and C = 3.50 µF, what is the numeric...

Q: The wiring for a refrigerator contains a starter capacitor. A voltage

The wiring for a refrigerator contains a starter capacitor. A voltage of amplitude 170 V and frequency 60.0 Hz applied across the capacitor is to produce a current amplitude of 0.850 A through the cap...

Q: Two plane mirrors intersect at right angles. A laser beam strikes

Two plane mirrors intersect at right angles. A laser beam strikes the first of them at a point 11.5 cm from their point of intersection, as shown in Fig. E33.1. For what angle of incidence at the firs...

Q: a. What is the reactance of a 3.00-

a. What is the reactance of a 3.00-H inductor at a frequency of 80.0 Hz? b. What is the inductance of an inductor whose reactance is 120 Ω at 80.0 Hz? c. What is the reactance of a 4.00-mF capacitor...

Q: You want the current amplitude through a 0.450-mH

You want the current amplitude through a 0.450-mH inductor (part of the circuitry for a radio receiver) to be 1.80 mA when a sinusoidal voltage with amplitude 12.0 V is applied across the inductor. Wh...