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AC source with an effective voltage of 240 V a Find the maximum voltage across one of the stove s elements when it is operating b The resistance of the operating element is 11 What is the effective current
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58 Explain the process of mutual induction within
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a vertical copper pipe a What is the direction of the induced current in the copper pipe as the bottom of the magnet passes b The induced current produces a magnetic field What is the direction of the induced magnetic field
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wire at 40 m/s through a 0050-T magnetic field How long must the wire be, and what should be the angle between the field and direction of motion to use the shortest wire
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251 Electric Current from Changing Magnetic Fields 60 A wire, 200-m long, moves at 40 m/s
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perpendicularly through a magnetic field An EMF of 40 V is induced in the wire What is the strength of the magnetic field
68 A 400-cm wire is moved perpendicularly through a
magnetic field of 032 T with a velocity of 13 m/s If this wire is connected into a circuit of 10resistance, what is the current
69 You connect both ends of a copper wire with a
total resistance of 010 to the terminals of a galvanometer The galvanometer has a resistance of 875 You then move a 100-cm segment of the wire upward at 10 m/s through a 20 10 2-T magnetic field What current will the galvanometer indicate
61 Airplanes An airplane traveling at 950 102 km/h
passes over a region where Earth s magnetic field is 45 10 5 T and is nearly vertical What voltage is induced between the plane s wing tips, which are 75 m apart
70 The direction of a 0045-T magnetic field is 60
above the horizontal A wire, 25-m long, moves horizontally at 24 m/s a What is the vertical component of the magnetic field b What EMF is induced in the wire
62 A straight wire, 075-m long, moves upward through
a horizontal 030-T magnetic field, as shown in Figure 25-23, at a speed of 16 m/s a What EMF is induced in the wire b The wire is part of a circuit with a total resistance of 11 What is the current
71 Dams A generator at a dam can supply 375 MW
(375 106 W) of electrical power Assume that the turbine and generator are 85 percent efficient a Find the rate at which falling water must supply energy to the turbine b The energy of the water comes from a change in potential energy, PE mgh What is the change in PE needed each second c If the water falls 22 m, what is the mass of the water that must pass through the turbine each second to supply this power
Figure 25-23
63 At what speed would a 020-m length of wire have
to move across a 25-T magnetic field to induce an EMF of 10 V
25 Electromagnetic Induction For more problems, go to Additional Problems, Appendix B
72 A conductor rotating in a magnetic field has a
length of 20 cm If the magnetic-flux density is 40 T, determine the induced voltage when the conductor is moving perpendicular to the line of force Assume that the conductor travels at a constant velocity of 1 m/s
77 Hair Dryers A hair dryer manufactured for use in
the United States uses 10 A at 120 V It is used with a transformer in England, where the line voltage is 240 V a What should be the ratio of the turns of the transformer b What current will the hair dryer now draw
73 Refer to Example Problem 1 and Figure 25-24 to
determine the following a induced voltage in the conductor b current flow (I) c direction of flux rotation around the conductor d polarity of point A relative to point B
R 10 A v 36 m/s
78 A 150-W transformer has an input voltage of 90 V
and an output current of 50 A a Is this a step-up or step-down transformer b What is the ratio of Voutput to Vinput
79 Scott connects a transformer to a 24-V source and
measures 80 V at the secondary circuit If the primary and secondary circuits were reversed, what would the new output voltage be
Mixed Review
EMF L 050 m Bout of page A
80 A step-up transformer s primary coil has 500 turns
Its secondary coil has 15,000 turns The primary circuit is connected to an AC generator having an EMF of 120 V a Calculate the EMF of the secondary circuit b Find the current in the primary circuit if the current in the secondary circuit is 30 A c What power is drawn by the primary circuit What power is supplied by the secondary circuit
70 10
Figure 25-24
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