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Chapter 21: Q70P (page 609)
In Fig. 21-25, four particles form a square. The charges are,, and. What is if the net electrostatic force on particle 1 is zero?
The value of the net electrostatic force is .
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If a cat repeatedly rubs against your cotton slacks on a dry day, the charge transfer between the cat hair and the cotton can leave you with an excess charge of .
(a) How many electrons are transferred between you and the cat?
You will gradually discharge via the floor, but if instead of waiting, you immediately reach toward a faucet, a painful spark can suddenly appear as your fingers near the faucet.
(b) In that spark, do electrons flow from you to the faucet or vice versa?
(c) Just before the spark appears, do you induce positive or negative charge in the faucet?
(d) If, instead, the cat reaches a paw toward the faucet, which way do electrons flow in the resulting spark?
(e) If you stroke a cat with a bare hand on a dry day, you should take care not to bring your fingers near the cat鈥檚 nose or you will hurt it with a spark. Considering that cat hair is an insulator, explain how the spark can appear.
A neutron consists of one 鈥渦p鈥� quark of charge and two 鈥渄own鈥� quarks each having charge. If we assume that the down quarks areapart inside the neutron, what is the magnitude of the electrostatic force between them?
A positively charged ball is brought close to an electrically neutral isolated conductor. The conductor is then grounded while the ball is kept close. Is the conductor charged positively, charged negatively, or neutral if (a) the ball is first taken away and then the ground connection is removed and (b) the ground connection is first removed and then the ball is taken away?
Three particles are fixed on an x-axis. Particle 1 of charge q1 is at x=-a, and particle 2 of charge q2is at x=+a. If their net electrostatic force on particle 3 of charge -Qis to be zero, what must be the ratio q1 /q2when particle 3 is at (a)x=+0.500a and (b) x=+1.50a?
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.108Nwhen their center-to-center separation is50.0cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres repel each other with an electrostatic force of 0.0360N. Of the initial charges on the spheres, with a positive net charge, what were (a) the negative charge on one of them and (b) the positive charge on the other?
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