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Understanding Electromagnetic Oscillations and Alternating Current: Concepts and Applications

In this chapter, we explore key concepts in electromagnetic oscillations and alternating current (AC) circuits. Topics covered include electromagnetic oscillations in LC circuits, resonance in RCL circuits, power in AC circuits, and the functionality of transformers for AC power transmission. Specific problems, such as calculating the magnetic force on a power line and analyzing induced EMF in vehicles traveling through Earth's magnetic field, will enhance conceptual understanding. This comprehensive overview is essential for mastering AC electrical systems and their practical applications.

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Understanding Electromagnetic Oscillations and Alternating Current: Concepts and Applications

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  1. Chapter 31 Electromagnetic Oscillations and Alternating Current In this chapter we will cover the following topics: -Electromagnetic oscillations in an LC circuit -Alternating current (AC) circuits with capacitors -Resonance in RCL circuits -Power in AC-circuits -Transformers, AC power transmission (31 - 1)

  2. A horizontal power line carries a current of 5000 A from south to north. Earth's magnetic eld (60 μT) is directed towards north and inclined down-ward 50degreesto the horizontal. Find the magnitude and direction of the magnetic force on 100 m of the line due to the Earth's field. • 23 N, west (2) 23 N, east (3) 30N, west (4) 30N, east (5) none of these I 50 N B

  3. Suppose this page is perpendicular to a uniform magnetic field and the magnetic flux through it is 5Wb. If the page is turned by 30◦ around an edge the flux through it will be: A. 2.5Wb B. 4.3Wb C. 5Wb D. 5.8Wb E. 10Wb

  4. A car travels northward at 75 km/h along a straight road in a region where Earth’s magnetic field has a vertical component of 0.50 × 10−4 T. The emf induced between the left and right side, separated by 1.7m, is: A. 0 B. 1.8mV C. 3.6mV D. 6.4mV E. 13mV

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  20. SUMMARY (31 - 17)

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  27. Transmission lines Erms=735 kV , Irms = 500 A home Step-down transformer Step-up transformer 110 V T2 T1 R = 220Ω Power Station (31 - 24)

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  31. Hitt A generator supplies 100 V to the primary coil of a transformer. The primary has 50 turns and the secondary has 500 turns. The secondary voltage is: A. 1000 V B. 500 V C. 250 V D. 100 V E. 10V

  32. hitt The main reason that alternating current replaced direct current for general use is: A. ac generators do not need slip rings B. ac voltages may be conveniently transformed C. electric clocks do not work on dc D. a given ac current does not heat a power line as much as the same dc current E. ac minimizes magnetic effects

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