Physics 201- Introduction to Electricity & Magnetism
August 28- Electric Charge






  How does one transfer charge from one object to another?

What does it mean to "ground" an object?

To "ground" and object means that we connect it to a large source of charges with a conductor (or directly touch the two).  The source will then supply whatever chrage is necessary to neutralize the object.  Physically, this means that either there are many free electrons in the source that can move to the previously positively charge object.  Or, the source can accept the ecess electrons from the previously negatively charged object.

22-1Q a) A positively charged rod attracts a small piece of cork.  Can we conclude that the cork is negatively charged?

22-1Q b) The rod repels another small piece of cork.  Can we conclude that this piece is positively charged?


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Jeff Phillips
Loyola Marymount University
Fall 2002