1. Classify each of the following statements as true or false.
A) The electric force between 2 charges doubles if both the charges are doubled. True False
B) The force between 2 charges doubles if the distance between them is doubled. True False
C) If the force between 2 charges is repulsive, then each charge must be positive. True False
2. Two charged particles, held not too far from each other, are released. As they move, the electric force on each particle increases. So, the particles must have
A) the same mass. B) charges of opposite signs. C) the same size. D)charges of the same sign. E) impossible to answer without additional information
3. A copper nucleus has 29 protons. How many electrons are found around this nucleus if the atom is neutral?
a. 29 b. 28 c. 30 d. Impossible to say
4. A positive charge and a negative charge held near each other are released. As they move, the force on each particle
a. stays the same. b. increases. c. decreases.
5. In an electrically neutral atom the number of protons in the nucleus is equal to the number of
A) neutrons in the nucleus. B) electrons that surround the nucleus. C) Choices A and B are both correct. D )Choices A and B are both incorrect.
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