# Electromagnetic Induction - PowerPoint PPT Presentation

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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.

• 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
• 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