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As the example implies, gravitational force is completely negligible on a small scale, where the interactions of individual charged particles are important. On a large scale, such as between the Earth and a person, the reverse is true. Most objects are nearly electrically neutral, and so attractive and repulsive Coulomb forces nearly cancel. Gravitational force on a large scale dominates interactions between large objects because it is always attractive, while Coulomb forces tend to cancel.
For questions 25–27, suppose that the electrostatics force between two charges is F .
What will be the force if the distance between them is halved?
(a)
Which of the following is false?
Which of the following is true about the gravitational force between the particles?
(d)
Two massive, positively charged particles are initially held a fixed distance apart. When they are moved farther apart, the magnitude of their mutual gravitational force changes by a factor of n . Which of the following indicates the factor by which the magnitude of their mutual electrostatic force changes?
(a) 3.60×10 10 N, (b) It will become 1/4 of the original value; hence it will be equal to 8.99×10 9 N
where and are two point charges separated by a distance , and
[link] shows the charge distribution in a water molecule, which is called a polar molecule because it has an inherent separation of charge. Given water's polar character, explain what effect humidity has on removing excess charge from objects.
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