Number 3 104-FUNDAMENTALS OF CIRCUITS44What is the SI unit of9.a. magnetic fluxb. magnetic flux densityQuestions and ProblemsThree de sources G,, G,, and G, (Fig. 57)generate voltages as follows:d. magnetomotive forcec. the pd. the p13permeability of cast iron at 0.2 TA distorA 001 =monic ofA 0- = ]0.7 T.quencyEs6We want to produce a flux densityThe cur14in an air gap having a length of 8Calculate the mmf required.A 09+ =Show the actual polarity (+)(-) of the ter-minals in each case.8.lags 36CalotiyIn Problem 1, if the three sources are con-2.Conductor AB in Figure 29 carries.15of 800 A flowing from B to A.nected in series, determine the voltage andpolarity across the open terminals if the fol-lowing terminals are connected together.a. Terminals 2-3 and 4-5b. Terminals 1-4 and 3-6c. Terminals 1-3 and 4-6b. Calculate the force on the movineh anc. E ansame direction as the direction of ma. Draw the waveshape of a sinusoidaage having a peak value of 200 V,frequency of 5 Hz.b. If the voltage is zero at t = 0, whatvoltage at t = 5 ms? 75 ms? 150 mgA sinusoidal current has an effective vaof 50 A. Calculate the peak value of cu3.Referring to Fig. 58, show the voltage andthe actual polarity of the generator terminalsat instants 1, 2, 3, and 4.A conductor 2 m long moves at a speed of60 km/h through a magnetic field having aflux density of 0.6 T. Calculate the inducedvoltage.A coil having 200 turns links a flux of3 mWb, produced by a permanent magnet.The magnet is moved, and the flux linkingthe coil falls to 1.2 mWb in 0.2 s. Calculate11A sinusoidal voltage of 120 V is applietresistor of 10 0.12re 59roblemCalculatethe average voltage induced.a. the effective current in the resistorb. the peak voltage across the resistor9-heG,3.G,4.9.DIusG,Figure 57See Problems 1 and 2.DIvolts+30peR2 3040secondsOLFigure 58See Problem 3.-30

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