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(a) How do electrons and protons compare? (Select all that apply.) Every electron has a negative charge, and every proton has a positive charge. The magnitude of the electron's charge is considerably larger than the magnitude of the proton's charge. The magnitude of the electron's charge is equal to the magnitude of the proton's charge. The magnitude of the electron's charge is considerably smaller than the magnitude of the proton's charge. The mass of the electron is considerably larger than the mass of the proton. The mass of the electron is about the same as the mass of the proton. The mass of the electron is considerably smaller than the mass of the proton.
(b) You have two identical metal spheres (identical aside from their net charges, that is). Sphere A has a net charge of +13.0 microcoulombs, while sphere B has a net charge of ?3.00 microcoulombs. The spheres are touched together briefly, and then separated. During this process, no net charge is removed from or added to the two-sphere system. After the spheres are separated, what is the net charge on sphere B?
(c) Justify your answer to part (b). This part is not graded, but it is useful to do for practice, because we ask these kinds of questions on the tests.
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