20_InstSolManual_PDF_Part21

20_InstSolManual_PDF_Part21 - Magnetic Field and Magnetic...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
20.74. Set Up: Ampere’s law says that the sum of around any closed curve equals where is the net current encircled by the curve. Solve: so 20.75. Set Up: The field lines are circles centered on the conductor. By symmetry, the magnitude of the field depends only on the distance from the wire. Ampere’s law says Apply this law to a circular path with radius r and with the wire at its center. Solve: On the path is tangent to the path and constant, so the current in the wire. Ampere’s law therefore gives and 20.76. Set Up: Apply Ampere’s law to a circle of radius r that has the axis of the conductors at its center. By symmetry is constant on this circle and is tangent to it, so Solve: (a) For the current in the inner conductor. Ampere’s law says (b) For Since the circle encloses both conductors and they carry currents in opposite directions. Ampere’s law says and 20.77. Set Up: A sketch of a cross section in a plane perpendicular to the common axis of the conductors is given in Figure 20.77. Let the inner conductor have current
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.

Ask a homework question - tutors are online