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wire. The flux lines converge at the magnetic poles.
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The overall magnitude of a magnetic field is measured in units called webers, abbreviated Wb. One weber is mathematically equivalent to one volt-second (1 V s). For weaker magnetic fields, a smaller unit, called the maxwell (Mx), is used. One maxwell is equal to 0.00000001 (one hundredmillionth) of a weber, or 0.01 microvolt-second (0.01 V s). The flux density of a magnetic field is given in terms of webers or maxwells per square meter or per square centimeter. A flux density of one weber per square meter (1 Wb/m2) is called one tesla (1 T). One gauss (1 G) is equal to 0.0001 T, or one maxwell per square centimeter (1 Mx/cm2). In general, as the electric current through a wire increases, so does the flux density near the wire. A coiled wire produces a greater flux density for a given current than a single, straight wire. And the more turns in the coil, the stronger the magnetic field will be. Sometimes, magnetic field strength is specified in terms of ampere-turns (At). This is actually a unit of magnetomotive force. A one-turn wire loop, carrying 1 A of current, produces a field of 1 At. Doubling the number of turns, or the current, doubles the number of ampere-turns. Therefore, if you have 10 A flowing in a 10-turn coil, the magnetomotive force is 10 10, or 100 At. Or, if you have 100 mA flowing in a 100-turn coil, the magnetomotive force is 0.1 100, or 10 At. (Remember that 100 mA = 0.1 A.) A less common unit of magnetomotive force is the gilbert (Gb). This unit is the equivalent of 0.796 At. Conversely, 1 At = 1.26 Gb.
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Refer to the text in this chapter if necessary. A good score is at least 18 correct answers. The answers are listed in the back of this book. 1. A positive electric pole (a) has a deficiency of electrons. (b) has fewer electrons than the negative pole. (c) has an excess of electrons. (d) has more electrons than the negative pole. 2. An EMF of 1 V (a) cannot drive much current through a circuit. (b) represents a low resistance. (c) can sometimes produce a large current. (d) drops to zero in a short time. 3. A potentially lethal electric current is on the order of (a) 0.01 mA. (b) 0.1 mA. (c) 1 mA. (d) 0.1 A.
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4. A current of 25 A is most likely drawn by (a) a flashlight bulb. (b) a typical household. (c) a utility power plant. (d) a small radio set. 5. A piece of wire has a conductance of 20 S. Its resistance is (a) 20 . (b) 0.5 . (c) 0.05 . (d) 0.02 . 6. A resistor has a value of 300 . Its conductance is (a) 3.33 mS. (b) 33.3 mS. (c) 333 S. (d) 0.333 S. 7. A span of wire 1 km long has a conductance of 0.6 S. What is the conductance of a span of this same wire that is 3 km long (a) 1.8 S (b) 0.6 S (c) 0.2 S (d) More information is necessary to determine this. 8. Approximately how much current can a 2-kW generator reliably deliver at 117 V (a) 17 mA (b) 234 mA (c) 17 A (d) 234 A 9. A circuit breaker is rated for 15 A at 117 V. Approximately how much power does this represent (a) 1.76 kW (b) 1760 kW (c) 7.8 kW (d) 0.0078 kW 10. You are told that an air conditioner has cooled a room by 500 Btu over a certain period of time. What is this amount of energy in kWh (a) 147 kWh (b) 14.7 kWh (c) 1.47 kWh (d) 0.147 kWh
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