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Chapter 29: Q42P (page 860)
In a particular region there is a uniform current density of in the positive z direction. What is the value of when that line integral is calculated along the three straight-line segments from (x, y, z) coordinates (4d, 0, 0) to (4d, 3d, 0) to (0, 0, 0) to (4d, 0, 0), where ?
The value of the is
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Question: Two long straight thin wires with current lie against an equally long plastic cylinder, at radius from the cylinder’s central axis.
Figure 29-58ashows, in cross section, the cylinder and wire 1 but not wire 2. With wire 2 fixed in place, wire 1 is moved around the cylinder, from angle localid="1663154367897" to angle localid="1663154390159" , through the first and second quadrants of the xycoordinate system. The net magnetic field at the center of the cylinder is measured as a function of . Figure 29-58b gives the x component of that field as a function of (the vertical scale is set by ), and Fig. 29-58c gives the y component(the vertical scale is set by ). (a) At what angle is wire 2 located? What are the (b) size and (c) direction (into or out of the page) of the current in wire 1 and the (d) size and (e) direction of the current in wire 2?
Question: In Fig 29-76 a conductor carriesalong the closed path abcdefgharunning along of the edges of a cube of edge length . (a)Taking the path to be a combination of three square current loops (bcfgb, abgha, and cdefc), find the net magnetic moment of the path in unit-vector notation.(b) What is the magnitude of the net magnetic field at the xyzcoordinates of?
Two long straight wires are parallel and apart .They are to carry equal currents such that the magnetic field at a point halfway between them has magnitude . (a) Should the currents be in the same or opposite directions? (b) How much current is needed?
In Fig.29-64, five long parallel wires in an xy plane are separated by distance . The currents into the page are ; the current out of the page is . What is the magnitude of the net force per unit length acting on wire 3 due to the currents in the other wires?
A solenoid that is long has a radius ofand a winding ofrole="math" localid="1663136568607" ; it carries a current of. Calculate the magnitude of the magnetic field inside the solenoid.
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