4.3.1 Magnetic Fields and Electromagnetic Induction The Earth’s Shield

4.3.1 Magnetic Fields and Electromagnetic InductionThe Earths Shield

All charges produce ELECTRIC FIELDSMoving charges produce MAGNETIC FIELDSPERPENDICULAR to the motion of the charge

Magnetic field linesElectromagnetic Induction

Making a MagnetMagnetism is a FIELD FORCENo contact required

All atoms have some natural of magnetismThree strongly magnetic elementsIRON, NICKEL, COBALT

Magnets produce magnetic fields Moving magnets produce ELECTRIC FIELDSPERPENDICULAR to motion of the magnetThis causes ELECTRICAL CURRENT to flowElectromagnetic Induction

Magnetic Field LinesRules for field line directionsOutside magnet NORTH TO SOUTHInside magnet SOUTH TO NORTH

Magnetic Field Maps

Magnetic Field Maps

Magnetic Field Maps

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

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

The needle of a compass is a small MAGNETThe north pole of a compass needle is marked with a small N or a prominent color points toward magnetic SOUTH poles.Compass

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

Convection currents in the outer iron core produce the Earths magnetic fieldThe geographic NORTH pole of the Earth acts like the SOUTH pole of a magnet!Earths Magnetic Field

The Magnetosphere

End of 4.3.1 PRACTICE