5.3 Coulomb's Law

The inverse-square force between two point charges, its direction along the line joining them, and vector superposition when several sources act at once.

University Physics Volume 2, 5.3 Coulomb's Law

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7 exercises

5.3 Exercise 1

What would be different if the electron also had a positive charge?

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5.3 Exercise 2

What would be different if $q_{1}$ were negative?

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5.3 Exercise 4

An atomic nucleus contains positively charged protons and uncharged neutrons. Since nuclei do stay together, what must we conclude about the forces between these nuclear particles?

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5.3 Exercise 9

Protons in an atomic nucleus are typically $10^{−15} \text{m}$ apart. What is the electric force of repulsion between nuclear protons?

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5.3 Exercise 11

Point charges $q_{1} = 50 \mu \text{C}$ and $q_{2} = −25 \mu \text{C}$ are placed 1.0 m apart. What is the force on a third charge $q_{3} = 20 \mu \text{C}$ placed midway between $q_{1}$ and $q_{2}$ ?

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5.3 Exercise 15

The net excess charge on two small spheres (small enough to be treated as point charges) is Q. Show that the force of repulsion between the spheres is greatest when each sphere has an excess charge Q/2. Assume that the distance between the spheres is so large compared with their radii that the spheres can be treated as point charges.

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5.3 Exercise 19

Two fixed particles, each of charge $5.0 \times 10^{−6} \text{C} ,$ are 24 cm apart. What force do they exert on a third particle of charge $−2.5 \times 10^{−6} \text{C}$ that is 13 cm from each of them?

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