Assignment 03

# Assignment 03 - Class PEP112S2007 Assignment 3 Assignment...

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Class PEP112S2007 Assignment 3 Assignment is due at 11:00pm on Sunday, February 11, 2007 Credit for problems submitted late will decrease to 0% over the course of 10 hour(s) after the deadline has passed. The wrong answer penalty is 1% per part. Multiple choice questions are penalized as described in the online help. The unopened hint bonus is 1% per part. You are allowed 10 attempts per answer. Reading Quiz 27.2 Part A Gauss’s law is useful for calculating electric fields that are ANSWER: due to point charges. uniform. symmetric. due to continuous charges. Reading Quiz 27.1 Part A What is the amount of electric field passing through a surface called? ANSWER: Electric flux Gauss’s law Electricity Charge surface density None of the above The Charge Inside a Conductor

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A spherical cavity is hollowed out of the interior of a neutral conducting sphere. At the center of the cavity is a point charge, of positive charge . Part A What is the total surface charge on the interior surface of the conductor (i.e., on the wall of the cavity)? Hint A.1 Gauss's law and properties of conductors Hint not displayed ANSWER: = Part B What is the total surface charge on the exterior surface of the conductor? Hint B.1 Properties of the conductor Hint not displayed ANSWER: = Part C
What is the magnitude of the electric field inside the cavity as a function of the distance from the point charge? Let , as usual, denote . Hint C.1 How to approach the problem Hint not displayed Part C.2 Charge distributions and finding the electric field Part not displayed ANSWER: 0 Part D What is the electric field outside the conductor? Hint D.1 How to approach the problem Hint not displayed Hint D.2 The distribution of Hint not displayed ANSWER: zero the same as the field produced by a point charge located at the center of the sphere the same as the field produced by a point charge located at the position of the charge in the cavity Now a second charge, , is brought near the outside of the conductor. Which of the following quantities would change? Part E

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The total surface charge on the wall of the cavity, : Hint E.1 Canceling the field due to the charge Hint not displayed ANSWER: would change would not change Part F The total surface charge on the exterior of the conductor, : Hint F.1 Canceling the field due to the charge Hint not displayed ANSWER: would change would not change Part G The electric field within the cavity, : ANSWER: would change would not change Part H The electric field outside the conductor, : ANSWER: would change would not change The Electric Field of a Ball of Uniform Charge Density
A solid ball of radius has a uniform charge density . Part A What is the magnitude of the electric field at a distance from the center of the ball? Hint A.1

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## This homework help was uploaded on 04/09/2008 for the course PEP 112 taught by Professor Whittaker during the Spring '07 term at Stevens.

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Assignment 03 - Class PEP112S2007 Assignment 3 Assignment...

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