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21 Cards in this Set
- Front
- Back
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A rod with an unknown charge attracts a plastic ball. Which one or more of the following might describe them?
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The rod is positive and the ball is negative. The rod is negative and the ball is positive. The rod is positive and the ball is uncharged. The rod is negative and the ball is uncharged.
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Electric charge
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occurs only in separate parcels, each of +-1.6x10^-19C
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Which one or more of the statements is not true?
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The electron and proton have the same mass. The proton and neutron have the same mass.
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The electrons in an atom
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are some distance away from the nucleus
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An object has a positive electric charge whenever
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it has a deficiency of electrons
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The nucleus of an atom
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contains most of the atoms mass
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In the formula F=kQaQb/r^2, the value of the constant k
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depends on the medium the charges are located in
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Relative to the electrical force between two protons, the gravitational force between them is
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weaker
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The elctric field at a point in space is equal in magnitude to
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the force a charge of one coloumb would experience there
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Electric field lines
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have the same pattern around a charged metal sphere as they do around a point charge
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Ten million electrons are placed on a solid copper sphere. The electrons become
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uniformly distributed on the spheres surface
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If 10,000 electrons are removed from a neutral plastic ball, its charge is now
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+1.6 x 10^-15 C
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Two charges of +Q are 1 cm apart. If one of the charges is replaced by a charge of -Q, the magnitude of the force between them is
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the same
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A charge of +q is placed 2 cm from a charge of -Q. A second charge of +q is then placed next to the first. The force on the charge of -Q
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increases to twice its fromer magnitude
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Two charges repel each other with a force of 10^-6 N when they are 10 cm apart. When they are brought closer together until they are 2 cm apart, the force between them becomes
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2.5 x 10^-5 N
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Two charges, one positive and the other negative, are initially 2 cm apart and are then pulled away from each other until they are 6 cm apart. The force between them is now smaller by a factor of
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9
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The force between two charges of -3.0 x 10^-9 C that are 50mm apart is
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3.2 x 10^-5 N
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Two equal charges attract each other with a force of 1.0 x 10^-5 N. When they are moved 4mm farther apart, the force between them becomes 2.5 x 10^-6 N. The original seperation of the charges was
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4 mm
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The magnitude of the charges in (Two equal charges attract each other with a force of 1.0 x 10^-5 N. When they are moved 4mm farther apart, the force between them becomes 2.5 x 10^-6 N. The original seperation of the charges was)(4 mm))
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1.3 x 10^-10 C
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The magnitude of the force of an electron in an electric field of 200 N/C is
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3.2 x 10^-17 N
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The elctric field 20 mm from a certain charge has a magnitude of 1.0 x 10^5 N/C. The magnitude of E 10 mm from the charge is
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4.0 x 10^5 N/C
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