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Physics 132 - General
Physics II - Professor
Bunson
Fall 2001
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Today's Lecture (9/3): |
| Summary: |
- If you have one charge creating a force
on another, the force is given by Coulomb's law. If you have several
charges, you need to add the forces as vectors.
- Because of the way forces add, a lack
of positive charge implies a negative charge and vice versa.
- There are two important types of materials
as far as electrostatics is concerned:
Insulators: Charge stays fixed.
Conductors: Charge is free to move.
- Three ways to charge an object are the following:
friction: a tug-o-war between different materials can result
in charge separation
contact: charge spreads out when given the chance.
induction: polarization occurs when a charge is near a conductor
and contact can take some away.
- Electric fields are another way of looking at
electrostatic forces. Rather than looking at a force at particular
point, you can think of a field at EVERY point that determines the
force. The electric field is defined as the force that would exist
on a test charge, q.
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| Conceptests: |
Today's
concept tests
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| Worked Problems: |
None today
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| Links: |
None today
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Assignments: |
Next
Reading Assignment (due 9/5)
Next
Homework (due 9/12)
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Diversion-of-the-week: |
This week's diversion involves folding
your money into funny shapes. I'm told that downtown stores love dollar
bill origami so give it a try!
(I recommend starting with the bow-tie.)
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September 3, 2001.
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