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Fundamentals of Physics, II (PHYS 201) The mechanism by which electric currents produce a magnetic field (Law of Biot-Savart) is discussed in greater detail. The field due to a single loop and an infinite wire are computed. Ampere's Law is derived. The operation of the DC electric motor is used to illustrate the torque generated on moving charges in a magnetic field. 00:00 - Chapter 1. Review of Magnetic Fields 14:00 - Chapter 2. Torque ...more
Fundamentals of Physics, II (PHYS 201) Lecture begins with a recap of Gauss's Law, its derivation, its limitation and its applications in deriving the electric field of several symmetric geometries—like the infinitely long wire. The electrical properties of conductors and insulators are discussed. Multiple integrals are briefly reviewed. 00:00 - Chapter 1. Derivation of Gauss' Law 21:12 - Chapter 2. The Electric Field due to a Spherical ...more
Wirt explains that the invention of the electric motor revolutionized the way factories operate. With steam power, there was one central boiler which dictated how the factory had to be organized. As electric motors evolved, it became possible to make small motors that could be distributed around the plant to provide power to individual machines allowing for greater flexibility. Now, electric motors are everywhere, he says....more
Martin Eberhard talks about the distribution plan for the new Electric Car. He mentions the restrictions and legal constraints for selling a car through a dealer. He believes direct distribution coupled with a gradual increase in the number of stores would be a critical factor in getting the electric car to the market. He finally notes that this strategy is easier than selling into an existing franchise.
Fundamentals of Physics, II (PHYS 201) The electric potential is defined for the electric field. It is introduced as an integral of the electric field making the field the derivative of the potential. After discussing the ideas of electric potential and field as presented in the previous lecture, the concept of capacitance is introduced as a means of storing charge and energy. 00:00 - Chapter 1. Review of Electric Potential 15:52 - Chapt...more
Fundamentals of Physics, II (PHYS 201) The electric field is introduced as the mediator of electrostatic interactions: objects generate the field which permeates all of space, and charged objects in the field experience a force with magnitude proportional to their charge. Several instructive examples are given, including the field of an electric dipole and the notion of the electric dipole and dipole moment. The notion of field lines is i...more
