# 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
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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
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17
End of 4.3.1 PRACTICE