24. Electric Force & Field; Gauss' Law

Coulomb's Law (Electric Force)

Textbook Question
(II) At each corner of a square of side ℓ there are point charges of magnitude Q, 2Q, 3Q, and 4Q (Fig. 21–57). Determine the magnitude and direction of the force on the charge 2Q.
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Multiple Choice
In case 1, a charge q is at the origin, and a charge 5q is 1 m away. In case 2, a charge q is at the origin, and a charge -5q is 1 m away. Is the magnitude of the force exerted on the charge at the origin in case 1 greater than, less than, or equal to the force in case 2?
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Multiple Choice
Two point charges each experience a 1 N electrostatic force when they are 2 cm apart. If they are moved to a new separation of 8 cm, what is the magnitude of the electric force on each of them?
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Multiple Choice
Two 1 kg masses are 1 m apart on a frictionless table. Each has +1 C of charge. What is the magnitude of the electric force on one of the masses according to Coulomb's Law?
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Textbook Question
Two equal point charges 2.5 cm apart, both initially neutral, are being charged at the rate of 5.0 nC/s. At what rate (N/s) is the force between them increasing 1.0 s after charging begins?
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Textbook Question
Two 10-cm-diameter charged rings face each other, 20 cm apart. The left ring is charged to −20 nC and the right ring is charged to +20 nC. What is the force on a proton at the midpoint?
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Textbook Question
Two protons are 2.0 fm apart. What is the magnitude of the gravitational force on one proton due to the other proton?
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