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4.3.1 Magnetic Fields and Electromagnetic Induction The Earth’s Shield.

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Presentation on theme: "4.3.1 Magnetic Fields and Electromagnetic Induction The Earth’s Shield."— Presentation transcript:

1 4.3.1 Magnetic Fields and Electromagnetic Induction The Earth’s Shield

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3 All charges produce ELECTRIC FIELDS Moving charges produce MAGNETIC FIELDS –PERPENDICULAR to the motion of the charge Magnetic field lines Electromagnetic Induction

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

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

7 Magnetic Field Maps N S

8 Magnetic Field Maps S N N S

9 Magnetic Field Maps S N

10 N S Determine the direction of the magnetic field lines at each point. Where is the field strongest? Example #1 Field is strongest at point C. BACD

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

12 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. Compass

13 Determine the direction in which the compass will point. Example #3 S N

14 Convection currents in the outer iron core produce the Earth’s magnetic field The geographic NORTH pole of the Earth acts like the SOUTH pole of a magnet! Earth’s Magnetic Field

15 The Magnetosphere

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17 End of 4.3.1 – PRACTICE


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