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# hw7sols - MasteringPhysics 11:43 PM Assignment Display Mode...

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3/9/08 11:43 PM MasteringPhysics Page 1 of 9 http://session.masteringphysics.com/myct Assignment Display Mode: View Printable Answers Physics 202 Assignment 7 Due at 11:00pm on Tuesday, March 11, 2008 View Grading Details Problem 28.12 Description: Two straight parallel wires are separated by d. There is a I current flowing in the first wire. (a) If the magnetic field strength is found to be zero between the two wires at a distance of r from the first wire, what is the magnitude of the current... Two straight parallel wires are separated by 6.5 . There is a 2.7 current flowing in the first wire. Part A If the magnetic field strength is found to be zero between the two wires at a distance of 2.5 from the first wire, what is the magnitude of the current in the second wire? Express your answer using two significant figures. ANSWER: = Part B What is the direction of the current in the second wire? ANSWER: currents flow opposite to each other currents flow at the same direction Problem 28.14 Description: A long pair of insulated wires serves to conduct I of dc current to and from an instrument. (a) If the wires are of negligible diameter but are 2.8 mm apart, what is the magnetic field 10.0 cm from their midpoint, in their plane (see the figure)? (b)... A long pair of insulated wires serves to conduct 55.0 of dc current to and from an instrument. Part A If the wires are of negligible diameter but are 2.8 apart, what is the magnetic field 10.0 from their midpoint, in their plane (see the figure)? Express your answer using two significant figures.

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3/9/08 11:43 PM MasteringPhysics Page 2 of 9 http://session.masteringphysics.com/myct ANSWER: = Part B Compare to the magnetic field of the Earth ( ). Express your answer using two significant figures. ANSWER: = Problem 28.21 Description: Two long wires are oriented so that they are perpendicular to each other. At their closest, they are 20.0 cm apart (see the figure). (a) What is the magnitude of the magnetic field at a point midway between them if the top one carries a current of... Two long wires are oriented so that they are perpendicular to each other. At their closest, they are 20.0 apart (see the figure ). Part A What is the magnitude of the magnetic field at a point midway between them if the top one carries a current of 20.0 and the bottom one carries 12.0 ? ANSWER: = Magnetic Field from Two Wires Description: Calculate, at several different locations, the net magnetic field due to two straight infinite wires carrying anti- parallel currents. Students are asked to look for a pattern in the results as the points of interest become more and more remote from the wires. Learning Goal: To understand how to use the principle of superposition in conjunction with the Biot-Savart (or Ampere's) law. From the Biot-Savart law, it can be calculated that the magnitude of the magnetic field due to a long straight wire is given by , where ( ) is the permeability constant, is the current in the wire, and is the distance from the wire to the location at which the magnitude of the magnetic field is being calculated.
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hw7sols - MasteringPhysics 11:43 PM Assignment Display Mode...

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