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Going over quiz.

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Presentation on theme: "Going over quiz."— Presentation transcript:

1 Going over quiz

2 Announcements Pick up a break packet on your way out if you haven’t already [You will have tomorrow’s class to begin working on it] Today: Go over quiz > Magnetism [last topic] > Go over homework (if time, otherwise tomorrow) Kaiying WON!

3

4 4.3.1 Magnetic Fields and Electromagnetic Induction
The Earth’s Shield Magnetic Fields and Electromagnetic Induction

5 First idea: Magnetic Fields

6 Making a Magnet Magnetism is a FIELD FORCE No contact required
All atoms naturally have “some” magnetism Three strongly magnetic elements IRON, NICKEL, COBALT

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

8 Magnetic Field Maps N S

9 Magnetic Field Maps S N N S

10 Magnetic Field Maps S N

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

12 Field is strongest at point F.
Example #2 Determine the direction of the magnetic field lines at each point. Where is the field strongest? H E S N N S F G Field is strongest at point F.

13 Second idea: Compass direction

14 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.

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

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

17 Third idea: Electromagnetic Induction

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

19

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

21 Practice

22

23 2

24 Going over Homework

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