# _001 - Solution for Homework 1 Electric Charge and...

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Solution for Homework 1 Electric Charge and Introduction to Devices Solution to Homework Problem 1.1(Comparison of Surface Charge Distributions) Problem: An insulating object has a uniform surface charge distribution of σ . It is broken into two parts of unequal sizes. The smaller piece has a surface charge distribution of σ 1 , and the larger piece has a surface charge distribution of σ 2 . Put the surface charge distributions ( σ , σ 1 , and σ 2 ) in order from smallest to largest. Select One of the Following: (a) σ 1 < σ 2 < σ (b) σ < σ 2 = σ 1 (c-Answer) σ = σ 1 = σ 2 (d) σ 1 = σ 2 < σ (e) Not enough information is given. Solution Order of Surface Charge Densities: The object initially has a uniform charge distribution. Breaking the object into pieces does not a±ect the charge distribution at all, so σ = σ 1 = σ 2 . Total Points for Problem: 3 Points Solution to Homework Problem 1.2(Comparing the Numbers of Electrons and Protons in a Neutral Atom) Problem: How does the number of electrons compare with the number of protons in a neutral atom? Select One of the Following: (a) There are more electrons than protons in a neutral atom. (b) There are more protons than electrons in a neutral atom. (c) There are no electrons or protons in a neutral atom. (d-Answer) There are equal amounts of electrons and protons in a neutral atom. (e) There is an in²nate amount of electrons and protons in a neutral atom. Solution A neutral atom has zero net charge. Since neutrons are neutral, and since the charge of an electron is equal in magnitude and opposite in sign to the charge of a proton, the number of electrons must be equal to the number

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## This note was uploaded on 05/04/2008 for the course PHYS 2074 taught by Professor Stewart during the Spring '08 term at Arkansas.

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_001 - Solution for Homework 1 Electric Charge and...

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