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Chapter 29: Magnetic Fields Due to Currents

Fundamentals Of Physics
Pages: 836 - 865

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98 Questions for Chapter 29: Magnetic Fields Due to Currents

  1. Figure 29-24 shows three circuits, each consisting of two radial lengths and two concentric circular arcs, one of radius rand the other of radius R>r. The circuits have the same current through them and the same angle between the two radial lengths. Rank the circuits according to the magnitude of the net magnetic field at the center, greatest first

    Found on Page 855
  2. Figure 29-82 shows, in cross section, two long parallel wires spaced by distance d=10.0cm; each carries 100A, out of the page in wire 1. Point Pis on a perpendicular bisector of the line connecting the wires. In unit-vector notation, what is the net magnetic field at Pif the current in wire 2 is (a) out of the page and (b) into the page?

    Found on Page 862
  3. A long wire carrying 100A is perpendicular to the magnetic field lines of a uniform magnetic field of magnitude 5.0 mT. At what distance from the wire is the net magnetic field equal to zero?

    Found on Page 863
  4. A long, hollow, cylindrical conductor (with inner radius 2.0mm and outer radius 4.0mm) carries a current of 24A distributed uniformly across its cross section. A long thin wire that is coaxial with the cylinder carries a current of 24A in the opposite direction. What is the magnitude of the magnetic field (a) 1.0mm,(b) 3.0mm, and (c) 5.0mm from the central axis of the wire and cylinder?

    Found on Page 863
  5. Question: In Fig 29-55, two long straight wires (shown in cross section) carry currentsi1=30.0mAandi1=40.0mAdirectly out of the page. They are equal distances from the origin, where they set up a magnetic field. To what value must current i1be changed in order to rotate20.0°clockwise?

    Found on Page 836
  6. Question: Figure 29-56ashows two wires, each carrying a current .Wire 1 consists of a circular arc of radius Rand two radial lengths; it carries current i1=2.0Ain the direction indicated. Wire 2 is long and straight; it carries a current i2 that can be varied; and it is at distanceR2from the center of the arc. The net magnetic fieldB→ due to the two currents is measured at the center of curvature of the arc. Figure 29-56bis a plot of the component of in the direction perpendicular to the figure as a function of current i2. The horizontal scale is set byi2s=1.00A. What is the angle subtended by th

    Found on Page 836
  7. Question:In Figure, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a=20cm. The currents are out of the page in wires 1 and 4 and into the page in wires 2 and 3, and each wire carries 20 A. In unit-vector notation, what is the net magnetic field at the square’s center?

    Found on Page 836
  8. Question: Two long straight thin wires with current lie against an equally long plastic cylinder, at radius R=20.0cmfrom the cylinder’s central axis.

    Found on Page 836
  9. In Fig. 29-4, a wire forms a semicircle of radius R=9.26cmand two (radial) straight segments each of length L=13.1cm. The wire carries current i=34.8mA. What are the(a) magnitude and(b) direction (into or out of the page) of the net magnetic field at the semicircle’s center of curvatur

    Found on Page 857
  10. Shows four identical currents iand five Amperian paths (athrough e) encircling them. Rank the paths according to the value of ∮B→.ds→taken in the directions shown, most positive first.

    Found on Page 856

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