1 Introduction, Measurement, Estimating 2 Describing Motion: Kinematics In One Dimension 3 Kinematics In Two Or Three Dimensions; Vectors 4 Dynamics: Newton's Laws Of Motion 5 Using Newton's Laws: Friction, Circular Motion, Drag Forces 6 Gravitation And Newton's Synthesis 7 Work And Energy 8 Conservation Of Energy 9 Linear Momentum 10 Rotationalmotion 11 Angular Momentum; General Rotation 12 Static Equilibrium; Elasticity And Fracture 13 Fluids 14 Oscillations 15 Wave Motion 16 Sound 17 Temperature, Thermal Expansion And The Ideal Gas Law 18 Kinetic Theory Of Gases 19 Heat And The First Law Of Thermodynamics 20 Second Law Of Thermodynamics 21 Electric Charge And Electric Field 22 Gauss's Law 23 Electric Potential 24 Capacitance, Dielectrics, Electric Energy Storage 25 Electric Currents And Resistance 26 Dc Circuits 27 Magnetism 28 Sources Of Magnetic Field 29 Electromagnetic Induction And Faraday's Law 30 Inductance, Electromagnetic Oscillations, And Ac Circuits 31 Maxwell's Equation And Electromagnetic Waves 32 Light: Reflection And Refraction 33 Lenses And Optical Instruments 34 The Wave Nature Of Light: Interference 35 Diffraction And Polarization 36 Special Theory Of Relativity 37 Early Quantum Theory And Models Of The Atom 38 Quantum Mechanics 39 Quantum Mechanics Of Atoms 40 Molecules And Solids 41 Nuclear Physics And Radioactivity 42 Nuclear Energy; Effects And Uses Of Radiation 43 Elementary Particles 44 Astrophysics And Cosmology expand_more
29.1 Induced Emf 29.2 Faraday’s Law Of Induction; Lenz’s Law 29.3 Emf Induced In A Moving Conductor 29.4 Electric Generators 29.5 Back Emf And Counter Torque; Eddy Currents 29.6 Transformers And Transmission Of Power 29.7 A Changing Magnetic Flux Produces An Electric Field 29.8 Applications Of Induction: Sound Systems, Computer Memory, Seismograph, Gfci Chapter Questions expand_more
Problem 1Q Problem 2Q: What is the difference between magnetic flux and magnetic field? Problem 3Q: Suppose you are holding a circular ring of wire and suddenly thrust a magnet, south pole first, away... Problem 4Q Problem 5Q: Is there a force between the two loops discussed in Question 4? If so, in what direction? Problem 6Q: Suppose you are looking along a line through the centers of two circular (but separate) wire loops,... Problem 7Q: The battery mentioned in Question 6 is disconnected. Will a current be induced in the second loop?... Problem 8Q Problem 9Q Problem 10Q: In situations where a small signal must travel over a distance, a shielded cable is used in which... Problem 11Q: What is the advantage of placing the two insulated electric wires carrying ac close together or even... Problem 12Q Problem 13Q: A region where no magnetic field is desired is surrounded by a sheet of low-resistivity metal. (a)... Problem 14Q: A cell phone charger contains a transformer. Why cant you just buy one universal charger to charge... Problem 15Q: An enclosed transformer has four wire leads coming from it. How could you determine the ratio of... Problem 16Q: The use of higher-voltage lines in homessay, 600 V or 1200 Vwould reduce energy waste. Why are they... Problem 17Q Problem 18Q Problem 19Q Problem 20Q: Will an eddy current brake (Fig. 2921) work on a copper or aluminum wheel, or must the wheel be... Problem 21Q: It has been proposed that eddy currents be used to help sort solid waste for recycling. The waste is... Problem 22Q: The pivoted metal bar with slots in Fig. 2935 falls much more quickly through a magnetic field than... Problem 23Q: If an aluminum sheet is held between the poles of a large bar magnet, it requires some force to pull... Problem 24Q: A bar magnet falling inside a vertical metal tube reaches a terminal velocity even if the tube is... Problem 25Q: A metal bar, pivoted at one end, oscillates freely in the absence of a magnetic field; but in a... Problem 26Q: Since a magnetic microphone is basically like a loudspeaker, could a loudspeaker (Section 27-6)... Problem 1P Problem 2P: (I) The north pole of the magnet in Fig. 2936 is being inserted into the coil. In which direction is... Problem 3P Problem 4P: (I) A 22.0-cm-diameter loop of wire is initially oriented perpendicular to a 1.5-T magnetic field.... Problem 5P Problem 6P: (II) A 10.8-cm-diameter wire coil is initially oriented so that its plane is perpendicular to a... Problem 7P: (II) A 16-cm-diameter circular loop of wire is placed in a 0.50-T magnetic field. (a) When the plane... Problem 8P: (II) (a) If the resistance of the resistor in Fig. 2938 is slowly increased, what is the direction... Problem 9P Problem 10P: (II) The magnetic field perpendicular to a circular wire loop 8.0 cm in diameter is changed from... Problem 11P: (II) A circular loop in the plane of the paper lies in a 0.75-T magnetic field pointing into the... Problem 12P: (II) Part of a single rectangular loop of wire with dimensions shown in Fig. 2940 is situated inside... Problem 13P: (II) While demonstrating Faradays law to her class, a physics professor inadvertently moves the gold... Problem 14P Problem 15P: (II) A 22.0-cm-diameter coil consists of 28 turns of circular copper wire 2.6 mm in diameter. A... Problem 16P: (II) A power line carrying a sinusoidally varying current with frequency f = 60 Hz and peak value I0... Problem 17P: (II) The magnetic field perpendicular to a single 18.2-cm-diameter circular loop of copper wire... Problem 18P Problem 19P: (II) A 25-cm-diameter circular loop of wire has a resistance of 150 . It is initially in a 0.40-T... Problem 20P: (II) The area of an elastic circular loop decreases at a constant rate, dA/dt = 3.50 102 m2/s. The... Problem 21P Problem 22P Problem 23P Problem 24P: (II) Inductive battery chargers, which allow transfer of electrical power without the need for... Problem 25P Problem 26P Problem 27P: (I) The moving rod in Fig. 2912b is 13.2 cm long and generates an emf of 120 mV while moving in a... Problem 28P: (I) The moving rod in Fig. 2912b is 12.0 cm long and is pulled at a speed of 15.0 cm/s. If the... Problem 29P Problem 30P: (II) If the U-shaped conductor in Fig. 2912a has resistivity r, whereas that of the moving rod is... Problem 31P: (II) Suppose that the U-shaped conductor and connecting rod in Fig. 2912a are oriented vertically... Problem 32P: (II) When a car drives through the Earths magnetic field, an emf is induced in its vertical... Problem 33P Problem 34P Problem 35P: (III) A short section of wire, of length a, is moving with velocity v, parallel to a very long wire... Problem 36P: (I) The generator of a car idling at 875-rpm produces 12.4 V. What will the output be at a rotation... Problem 37P Problem 38P: (II) A simple generator has a 480-loop square coil 22.0 cm on a side. How fast must it turn in a... Problem 39P: (II) Show that the rms output of an ac generator is Vrms=NAB/2 where =2f. Problem 40P: (II) A 250-loop circular armature coil with a diameter of 10.0 cm rotates at 120 rev/s in a uniform... Problem 41P Problem 42P: (I) A motor has an armature resistance of 3.05 . If it draws 7.20 A when running at full speed and... Problem 43P: (II) What will be the current in the motor of Example 2910 if the load causes it to run at half... Problem 44P: (II) The back emf in a motor is 85 V when the motor is operating at 1100 rpm. How would you change... Problem 45P Problem 46P: (I) A transformer has 620 turns in the primary coil and 85 in the secondary coil. What kind of... Problem 47P: (I) Neon signs require 12 kV for their operation. To operate from a 240-V line, what must be the... Problem 48P: (II) A model-train transformer plugs into 120-V ac and draws 0.35 A while supplying 7.5 A to the... Problem 49P: (II) The output voltage of a 75-W transformer is 12 V, and the input current is 22 A. (a) Is this a... Problem 50P: (II) If 65 MW of power at 45 kV (rms) arrives at a town from a generator via 3.0- transmission... Problem 51P Problem 52P: (III) Design a dc transmission line that can transmit 225 MW of electricity 185 km with only a 2.0%... Problem 53P: (III) Suppose 85 kW is to be transmitted over two 0.100- lines. Estimate how much power is saved if... Problem 54P Problem 55P: (II) The betatron, a device used to accelerate electrons to high energy, consists of a circular... Problem 56P: (III) Show that the electrons in a betatron, Problem 55 and Fig. 2948, are accelerated at constant... Problem 57P: (III) Find a formula for the net electric field in the moving rod of Problem 34 as a function of... Problem 58GP Problem 59GP: A square loop 27.0 cm on a side has a resistance of 7.50 . It is initially in a 0.755-T magnetic... Problem 60GP: Power is generated at 24 kV at a generating plant located 85 km from a town that requires 65 MW of... Problem 61GP Problem 62GP Problem 63GP: A pair of power transmission lines each have a 0.80- resistance anti carry 740 A over 9.0 km. If the... Problem 64GP: Show that the power loss in transmission lines, PL, is given by PL=(PT)2RL/V2, where PT is the power... Problem 65GP: A high-intensity desk lamp is rated at 35 W but requires only 12 V. It contains a transformer that... Problem 66GP Problem 67GP: A coil with 150 turns, a radius of 5.0 cm, and a resistance of 12 surrounds a solenoid with 230... Problem 68GP: A search coil for measuring B (also called a flip coil) is a small coil with N turns, each of... Problem 69GP: A ring with a radius of 3.0 cm and a resistance of 0.025 is rotated about an axis through its... Problem 70GP: A flashlight can be made that is powered by the induced current from a magnet moving through a coil... Problem 71GP: A small electric car overcomes a 250-N friction force when traveling 35 km/h. The electric motor is... Problem 72GP: What is the energy dissipated as a function of time in a circular loop of 18 turns of wire having a... Problem 73GP: A thin metal rod of length rotates with angular velocity about an axis through one end (Fig.... Problem 74GP: The magnetic field of a shunt-wound dc motor is produced by field coils placed in parallel with the... Problem 75GP Problem 76GP: A circular metal disk of radius R rotates with angular velocity about an axis through its center... Problem 77GP: What is the magnitude and direction of the electric field at each point in the rotating disk of... Problem 78GP Problem 79GP Problem 80GP format_list_bulleted