MasteringPhysics Assignment Print View

# MasteringPhysics Assignment Print View - HW 02 Due 11:00pm...

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HW 02 Due: 11:00pm on Tuesday, February 8, 2011 Note: To understand how points are awarded, read your instructor's Grading Policy . [Switch to Standard Assignment View ] Charge Distribution on a Conductor with a Cavity A positive charge is brought close to a fixed neutral conductor that has a cavity. The cavity is neutral; that is, there is no net charge inside the cavity. Part A Which of the figures best represents the charge distribution on the inner and outer walls of the conductor? Hint A.1 Conductors have no internal field Hint not displayed Hint A.2 Charges on the cavity walls Hint not displayed ANSWER: 1 2 3 Correct

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Flux through a Cube A cube has one corner at the origin and the opposite corner at the point . The sides of the cube are parallel to the coordinate planes. The electric field in and around the cube is given by . Part A Find the total electric flux through the surface of the cube. Hint A.1 Definition of flux Hint not displayed Hint A.2 Flux through the face Hint not displayed Hint A.3 Flux through the face Hint not displayed Hint A.4 Flux through the face Hint not displayed Hint A.5 Flux through the face Hint not displayed Hint A.6 Putting it together
Hint not displayed Express your answer in terms of , , , and . ANSWER: = Correct Part B Notice that the flux through the cube does not depend on or . Equivalently, if we were to set , so that the electric field becomes , then the flux through the cube would be zero. Why? ANSWER: does not generate any flux across any of the surfaces. The flux into one side of the cube is exactly canceled by the flux out of the opposite side. Both of the above statements are true. Correct Part C What is the net charge inside the cube? Hint C.1 Gauss's law Hint not displayed Express your answer in terms of , , , , and . ANSWER: = Correct The Electric Field and Surface Charge at a Conductor Learning Goal: To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor.

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A conductor is placed in an external electrostatic field. The external field is uniform before the conductor is placed within it. The conductor is completely isolated from any source of current or charge. Part A
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MasteringPhysics Assignment Print View - HW 02 Due 11:00pm...

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