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Electromagnetic Induction

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Electromagnetic Induction Currents Create Magnetic Fields 1820 Hans Christian Oersted found that magnetism was produced by current-carrying wires. – PowerPoint PPT presentation

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Title: Electromagnetic Induction


1
ElectromagneticInduction
2
Currents Create Magnetic Fields
  • 1820 Hans Christian Oersted found that magnetism
    was produced by current-carrying wires.

3
Electromagnetic Induction
1832
  • When a magnet is plunged into the coil, voltage
    is induced in the coil and charges in the coil
    are set in motion.

Michael Faraday
  • Voltage is induced in the wire loop either when
    the magnetic field moves past the wire or the
    wire moves through the magnetic field.

Joseph Henry
4
More Loops More Voltage
  • more difficult to push the magnet into a coil
    with more loops because the magnetic field of
    each current loop resists the motion of the
    magnet.

5
Faradays Law
  • The induced voltage in a coil is proportional to
    the product of
  • the number of loops
  • and the rate at which the magnetic field changes
    within those loops.

6
Magnetic Media
  • Computer Hard Drive

7
Faradays Law the Flip Side
1860s
  • A magnetic field is created in any region of
    space in which an electric field is changing with
    time.
  • The magnitude of the induced magnetic field is
    proportional to the rate at which the electric
    field changes.
  • The direction of the induced magnetic field is at
    right angles to the changing electric field.

8
Let there be light
  • An electric field is created in any region of
    space in which a magnetic field is changing with
    time.
  • A magnetic field is created in any region of
    space in which an electric field is changing with
    time.
  • Voila electromagnetic waves
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