College Physics

(23.42) L = (4π×10−7T ⋅ m/A)(200)^2 (1.26×10 −3 m^2 ) 0.100 m = 0.632 mH. Discussion This solenoid is moderate in size. Its indu ...

Figure 23.44(a) AnRLcircuit with a switch to turn current on and off. When in position 1, the battery, resistor, and inductor ar ...

Strategy for (b) We can find the current by usingI=I 0 e−t/τ, or by considering the decline in steps. Since the time is twice th ...

withf the frequency of the AC voltage source in hertz (An analysis of the circuit using Kirchhoff’s loop rule and calculus actua ...

discharged (Q = 0on it) and the voltage across it is zero. The current remains negative between points a and b, causing the volt ...

the most, since low frequency allows them time to become charged and stop the current. Capacitors can be used to filter out low ...

HereI 0 is the peak current,V 0 the peak source voltage, andZis the impedance of the circuit. The units of impedance are ohms, a ...

At 60.0 Hz, the values of the reactances were found inExample 23.10to beXL= 1.13 Ω and inExample 23.11to beXC= 531 Ω. Entering t ...

and broader for the higher-resistance circuit. Thus the higher-resistance circuit does not resonate as strongly and would not be ...

Thuscosφis called thepower factor, which can range from 0 to 1. Power factors near 1 are desirable when designing an efficient m ...

Figure 23.51The forced but damped motion of the wheel on the car spring is analogous to anRLCseries AC circuit. The shock absorb ...

back emf: capacitive reactance: characteristic time constant: eddy current: electric generator: electromagnetic induction: emf i ...

shock hazard: step-down transformer: step-up transformer: thermal hazard: three-wire system: transformer equation: transformer: ...

Circuit breakers and fuses interrupt excessive currents to prevent thermal hazards. The three-wire system guards against therma ...

XL= 2πfL, withf the frequency of the AC voltage source in hertz. • Inductive reactanceXLhas units of ohms and is greatest at hig ...

23.3 Motional Emf 7.Why must part of the circuit be moving relative to other parts, to have usable motional emf? Consider, for e ...

Figure 23.55Capacitors and inductors. Capacitor with high frequency and low frequency. 28.If the capacitors inFigure 23.55are re ...

Problems & Exercises 23.1 Induced Emf and Magnetic Flux 1.What is the value of the magnetic flux at coil 2 inFigure 23.56due ...

22.In the August 1992 space shuttle flight, only 250 m of the conducting tether considered inExample 23.2could be let out. A 40. ...

input? (b) What is the power input? (c) Is this amount of power reasonable for a small appliance? 47.(a) What is the voltage out ...