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College Physics Reasoning and Relationships

Physics & Astronomy

Quiz 17 :

Electric Forces and Fields

Quiz 17 :

Electric Forces and Fields

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About how many electrons are in 0.3 gram of water (H2O)?
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Multiple Choice
Answer:

Answer:

A

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Object A has a charge q on it, object B has a charge q on it, and object C has a charge 2q on it. These charges are arranged, one each, at the vertices of an equilateral triangle. Which charge has the greatest magnitude electric force on it?
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Answer:

B

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Two identical iron spheres have equal positive charges and the force between them when they are 1 m apart is 4 N. What percentage of the electrons has been removed from each sphere if each sphere has 1 mole (6 1023) of iron atoms? (ke = 8.99 109 Nm2/C2, the atomic number of iron is 26, and the electron charge is 1.6 1019 C)
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Multiple Choice
Answer:

Answer:

A

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Two point charges, separated by 15 cm, have charge values of +2.0 µC and 4.0 µC, respectively. What is the value of the mutual force between them? (ke = 8.99 109 Nm2/C2)
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The constant ke, which appears in Coulomb's law formula, is equivalent dimensionally to which of the following?
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Two identical balls have the same amount of charge, but the charge on ball A is positive and the charge on ball B is negative. The balls are placed on a smooth, level, frictionless table whose top is an insulator. Which of the following is true?
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If the size of the charge value is tripled for one of two point charges maintained at a constant separation, the mutual force between them will be changed by what factor?
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If the distance between two point charges is quadrupled, the mutual force between them will be changed by what factor?
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Two identical spheres each carry a charge of 40.0 µC. The spheres are separated by a distance of 2.00 m. What is the electric force between the spheres? (ke = 8.99 109 N·m2/C2)
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A repelling force must occur between two charged objects under which conditions?
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Doug rubs a piece of fur on a hard rubber rod, giving the rod a negative charge. What happens?
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Two electrons are separated by one cm. What is the ratio of the electric force to the gravitational force between them? (me = 9.11 1031 kg, ke = 8.99 109 Nm2/C2, G = 6.67 10-11 Nm2/kg2, and e = 1.6 1019 C)
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The charge per unit length on an insulator is img . On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
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Two point charges are 4 cm apart. They are moved to a new separation of 8 cm. By what factor does the resulting mutual force between them change?
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A 6.00-C charge is placed at the origin and a second charge is placed on the x axis at x = 0.300 m. If the resulting force on the second charge is 6.40 N in the negative x direction, what is the force on the charge at the origin?
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A 6.0-mC charge is placed at the origin and a second charge is placed on the x axis at x = 0.30 m. If the resulting force on the second charge is 5.4 N in the positive x direction, what is the value of its charge?
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An electron is sent at high speed toward a gold nucleus (charge +79e). What is the electrical force acting on the electron when it is 3.0 1013 m away from the gold nucleus? (e = 1.6 1019 C, ke = 8.99 109 N·m2/C2)
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A metallic object holds a charge of 2.9 105 C. What total number of electrons does this represent? (e = 1.6 1019 C is the magnitude of the electronic charge.)
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Two equal charges, each Q, are separated by some distance. What third charge would need to be placed half way between the two charges so that the net force on each charge would be zero?
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In a thundercloud there may be an electric charge of +40 C near the top of the cloud and 40 C near the bottom of the cloud. These charges are separated by about 2.0 km. What is the electric force between these two sets of charges? (ke = 8.99 109 N·m2/C2)
Multiple Choice
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