Lecture 24 Last Lecture Dynamic Filed Faraday’s Law Stationary loop in a time-varying Magnetic field Exam III, Nov. 24, Monday, 12:30 –1:30pm, SW 401, Chapter 3, 4, 5

Lecture 23 Static field Dynamic Field

Lecture 23 Faraday’s Law

Lecture 23 Electromotive force Stationary Loop in a Time-varying Magnetic field Lenz’s law

Lecture 23 An example: Faraday’s law, differential form (a) The magnetic flux link of a single turn of the inductor. (b) The transformer emf,. (c) The polarity of the emf. (d) The induced current.

Lecture 23 Example II Determine the voltage drops across the two resistors

Lecture 24 Today The ideal Transformer Moving Conductor in a Static Magnetic Field

Lecture 24 The ideal Transformer properties:  =  I = 0 in the core. The magnetic flux is confined within the core I = ?, with applied voltage of V1and with RL V2, and I2=? Questions:

Lecture 24 Voltage transformer: Power relations: Why? Current transformer: Impedance transformer:

Lecture 24 Moving conductor in a static magnetic field:

Lecture 24 Another way to look at it: Next lecture: The electromagnetic generator Moving conductor in a time varying magnetic field