4.3.1 Magnetic Fields and Electromagnetic Induction - PowerPoint PPT Presentation

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4.3.1 Magnetic Fields and Electromagnetic Induction

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The Earth s Shield 4.3.1 Magnetic Fields and Electromagnetic Induction All charges produce ELECTRIC FIELDS Moving charges produce MAGNETIC FIELDS PERPENDICULAR to ... – PowerPoint PPT presentation

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Title: 4.3.1 Magnetic Fields and Electromagnetic Induction


1
The Earths Shield
4.3.1 Magnetic Fields and Electromagnetic
Induction
2
(No Transcript)
3
Electromagnetic Induction
  • All charges produce ELECTRIC FIELDS
  • Moving charges produce MAGNETIC FIELDS
  • PERPENDICULAR to the motion of the charge

Magnetic field lines
4
Making a Magnet
  • Magnetism is a FIELD FORCE
  • No contact required
  • All atoms have some natural of magnetism
  • Three strongly magnetic elements
  • IRON, NICKEL, COBALT

5
Electromagnetic Induction
  • Magnets produce magnetic fields
  • Moving magnets produce ELECTRIC FIELDS
  • PERPENDICULAR to motion of the magnet
  • This causes ELECTRICAL CURRENT to flow

6
Magnetic Field Lines
  • Rules for field line directions
  • Outside magnet ? NORTH TO SOUTH
  • Inside magnet ? SOUTH TO NORTH

7
Magnetic Field Maps
8
Magnetic Field Maps
9
Magnetic Field Maps
10
Example 1
  • Determine the direction of the magnetic field
    lines at each point. Where is the field
    strongest?

Field is strongest at point C.
N S
11
Example 2
  • Determine the direction of the magnetic field
    lines at each point. Where is the field
    strongest?

Field is strongest at point F.
12
Compass
  • The needle of a compass is a small MAGNET
  • The north pole of a compass needle
  • is marked with a small N or a prominent color
  • points toward magnetic SOUTH poles.

13
Example 3
  • Determine the direction in which the compass will
    point.

14
Earths Magnetic Field
  • Convection currents in the outer iron core
    produce the Earths magnetic field

The geographic NORTH pole of the Earth acts like
the SOUTH pole of a magnet!
15
The Magnetosphere
16
(No Transcript)
17
End of 4.3.1 PRACTICE
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