5.1 Electric Charge

Two signs of charge with attraction and repulsion, quantization in units of the elementary charge, and conservation of the total during any transfer.

University Physics Volume 2, 5.1 Electric Charge

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6 exercises

5.1 Exercise 1

There are very large numbers of charged particles in most objects. Why, then, don’t most objects exhibit static electricity?

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5.1 Exercise 3

A positively charged rod attracts a small piece of cork. (a) Can we conclude that the cork is negatively charged? (b) The rod repels another small piece of cork. Can we conclude that this piece is positively charged?

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5.1 Exercise 5

How would you determine whether the charge on a particular rod is positive or negative?

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5.1 Exercise 6

Common static electricity involves charges ranging from nanocoulombs to microcoulombs. (a) How many electrons are needed to form a charge of −2.00 nC? (b) How many electrons must be removed from a neutral object to leave a net charge of $0.500 \mu \text{C}$ ?

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5.1 Exercise 8

To start a car engine, the car battery moves $3.75 \times 10^{21}$ electrons through the starter motor. How many coulombs of charge were moved?

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5.1 Exercise 10

A 2.5-g copper penny is given a charge of $−2.0 \times 10^{−9} \text{C}$ . (a) How many excess electrons are on the penny? (b) By what percent do the excess electrons change the mass of the penny?

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