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**Unformatted text preview: **04/19/2007 02:22 PM MasteringPhysics: Assignment Print View Page 1 of 16 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1064958 [ Assignment View ] E ð lisfræ ð i 2, vor 2007 28. Sources of Magnetic Field Assignment is due at 2:00am on Wednesday, March 7, 2007 Credit for problems submitted late will decrease to 0% after the deadline has passed. The wrong answer penalty is 2% per part. Multiple choice questions are penalized as described in the online help. The unopened hint bonus is 2% per part. You are allowed 4 attempts per answer. B-Field from Moving Charges Magnetic Field near a Moving Charge A particle with positive charge is moving with speed along the z axis toward positive . At the time of this problem it is located at the origin, . Your task is to find the magnetic field at various locations in the three-dimensional space around the moving charge. Part A Which of the following expressions gives the magnetic field at the point due to the moving charge? A. B. C. D. ANSWER: Answer not displayed Part B Find the magnetic field at the point . Part B.1 Find the magnetic field direction Part not displayed Express your answer in terms of , , , and , and use , , and for the three unit vectors. ANSWER: = Answer not displayed Part C Find the magnetic field at the point . Express your answer in terms of , , , , and , and use , , and for the three unit vectors. ANSWER: = Answer not displayed Part D Find the magnetic field at the point . Part D.1 Evaluate the cross product Part not displayed Part D.2 Find the distance from the charge Part not displayed Express your answer in terms of , , , , , and , and use , , and for the three unit vectors. [ Pr 04/19/2007 02:22 PM MasteringPhysics: Assignment Print View Page 2 of 16 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1064958 ANSWER: = Answer not displayed Part E The field found in this problem for a moving charge is the same as the field from a current element of length carrying current provided that the quantity is replaced by which quantity? Hint E.1 Making a correlation Hint not displayed ANSWER: Answer not displayed Force between Moving Charges Two point charges, with charges and , are each moving with speed toward the origin. At the instant shown is at position (0, ) and is at ( , 0). (Note that the signs of the charges are not given because they are not needed to determine the magnitude of the forces between the charges.) Part A What is the magnitude of the electric force between the two charges? Hint A.1 Which law to use Apply Coulomb's law: where is the distance between the two charges. Part A.2 Find the value of What is the value of for the given situation? ...

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