# pp22 - PHYSICS: A World View Tuesday, 12 April 2005 READ Ch...

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PHYSICS: A World View Tuesday, 12 April 2005 READ Ch 20 (p 424 - 431) PRAC Ch 20: Q 9, 15, 21, 23; E 1 HW #22 Ch 20: Q 12, 16, 24; E 2 Th 14 Apr

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Charge! Charge!
Rubber Glass Rubber Glass Wood Wood repel repel attract attract attract attract attract attract nothing CHARGED NEUTRAL (negative) (positive)

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Rubber Glass Rubber Glass Wood Wood repel repel attract attract attract attract attract attract nothing (negative) (positive) What about magnets? Electrically Neutral!
BASIC MODEL

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Modern view charge comes in two flavors  (positive and negative) normally balanced (neutral) the amount of positive charge in  an object is fixed! imbalance causes “charge”
add -’ve (electrons) Neutral (equal positive and negative) + -

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+ - negative
remove -’ve (electrons) Neutral (equal positive and negative) + -

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+ - positive How many electrons is it? Typical: 1x10 8 !!
Problem: A bushel basket contains 50  apples.  How much of a bushel  is just one apple?

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we measure in units called  Coulombs (C)
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## pp22 - PHYSICS: A World View Tuesday, 12 April 2005 READ Ch...

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