# Ch21 HW4 - Ch21 HW4 F2010 9:28 PM WebAssign Ch21 HW4...

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12/17/10 9:28 PM Ch21 HW4 F2010 Page 1 of 4 http:[email protected][email protected] Current Score : 26 / 26 Due : Wednesday, October 27, 2010 11:25 AM EDT 1. 6/6 points Question: MI3 21.4.X.063 A copper wire with square cross section carries a conventional current I in the -x direction. There is a magnetic field B in the +z direction. Draw a diagram illustrating the situation, to help you answer the following questions. What is the direction of E parallel , the electric field that causes the current to flow? -x -x What is the direction of the drift velocity of the mobile electrons? +x +x What is the direction of the magnetic force on the moving electrons? +y +y What is the direction of E transverse , the electric field due to the Hall effect, inside the wire? +y +y If the mobile charges had been positive (holes) instead of negative, what would have been the direction of the magnetic force on the moving positive charges? +y +y If the mobile charges had been positive instead of negative, what would have been the direction of the transverse electric field? -y -y Solution or Explanation Remember that positive charges (holes) would move in the direction of conventional current (in the direction of E parallel ), but negative charges (electrons) move opposite to E parallel . 2. 9/9 points Question: MI3 21.4.P.066 Ch21 HW4 F2010 (Homework) Stefan Coreth PY 208, section 002M, Fall 2010 Instructor: Laura I. Clarke Web Assign The due date for this assignment is past. Your work can be viewed below, but no changes can be made.

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## This note was uploaded on 11/10/2011 for the course PHYSICS 208m taught by Professor Beichner during the Fall '08 term at N.C. State.

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Ch21 HW4 - Ch21 HW4 F2010 9:28 PM WebAssign Ch21 HW4...

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