Sign In | Subscribe

Enter your Sign on user name and password.

Forgot password?
  • Follow us on:
Start learning today, and be successful in your academic & professional career. Start Today!
Loading video...
This is a quick preview of the lesson. For full access, please Log In or Sign up.
For more information, please see full course syllabus of AP Physics C/Electricity and Magnetism
  • Discussion

  • Study Guides

  • Download Lecture Slides

  • Table of Contents

Start Learning Now

Our free lessons will get you started (Adobe Flash® required).
Get immediate access to our entire library.

Sign up for

Membership Overview

  • Unlimited access to our entire library of courses.
  • Search and jump to exactly what you want to learn.
  • *Ask questions and get answers from the community and our teachers!
  • Practice questions with step-by-step solutions.
  • Download lesson files for programming and software training practice.
  • Track your course viewing progress.
  • Download lecture slides for taking notes.
  • Learn at your own pace... anytime, anywhere!

Induced Electric Field

  • A changing (in time) magnetic field induces an electric field. So if a magnetic field exists in space and it varies with time, then an electric field will necessarily exist in space.
  • The value of the induced electric field is obtained by noting that the integral of E.ds around any closed loop is equal to minus the derivative of the magnetic flux with respect to time; this is nothing but a restatement of Faraday’s law.
  • Two examples that illustrate how to evaluate the induced electric field are given in the lecture. In the first example a magnetic field, uniform in space, is slowly turned off. The other example shows how an AC generator works.

Induced Electric Field

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Change B to Induce E 0:54
    • Loop with Magnetic Field B
    • Flux is Positive With Choice of 'n'
    • Suppose Magnetic Field is Changing
    • B Changing with time Flux (>0)
    • Change in Electric Field Induces magnetic Field
  • Example 21:08
    • Cylinder with Magnetic Field
    • Fill With Radius 'r'
    • Turn Off the Field
    • Magnetic Flux Through Big Loop
  • AC Generator 38:28
    • Magnetic Field with Coil of Many Turns
    • As the Coil Rotates Flux is Induced
    • Coil Rotated by Angle
    • Coil Connected to The Ring and End Connected to Lamp
    • Kinetic Energy Strike the Coil and Rotating Coil will Produce Electric Energy
  • Example 1: Electric Field
  • Example 2: Electric Field