Which of the following statements is NOT true regarding electric charges? O a. Electric charges are conserved O b. Electric charges are quantized O. A neutral atom contains equal more positive charges than negative charges O d. The S.l. unit for electric charge is Coulomb

Which of the following statements is NOT true regarding electric charges? O a. Electric charges are conserved O b. Electric charges are quantized O. A neutral atom contains equal more positive charges than negative charges O d. The S.l. unit for electric charge is Coulomb

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter20: Static Electricity

Section: Chapter Questions

Problem 53A

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In the Millikan oil-drop experiment illustrated in Figure 15.21, an atomizer (a sprayer with a fine nozzle) is used to introduce many tiny droplets of oil between two oppositely charged parallel metal plates. Some of the droplets pick up one or more excess electrons. The charge on the plates is adjusted so that the electric force on the excess electrons exactly balances the weight of the droplet. The idea is to look for a droplet dial has the smallest electric force and assume it has only one excess electron. This strategy lets the observer measure the charge on the electron. Suppose we are using an electric field of 3 104 N/C. The charge on one electron is about 1.6 1019 C. Estimate the radius of an oil drop of density 858 kg/m5 for which its weight could be balanced by the electric force of this field on one electron. (Problem 42 is courtesy of E.F. Redish. For more problems of this type, visit www.physics.umd.cdu/pcrg/.)
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