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Chapter 29: Q. 18 (page 831)
A small, square loop carries a current. The on-axis magnetic field strength from the loop is . What is the edge length of the square?
The edge length is
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A long wire carrying a A current perpendicular to the xy-plane intersects the x-axis at. A second, parallel wire carrying a A current intersects the x-axis at cm. At what point or points on the x-axis is the magnetic field zero if
(a) the two currents are in the same direction and
(b) the two currents are in opposite directions?
The coaxial cable shown in FIGURE P29.56 consists of a solid inner conductor of radius surrounded by a hollow, very thin outer conductor of radius . The two carry equal currents I, but in opposite directions. The current density is uniformly distributed over each conductor.
a. Find expressions for three magnetic fields: within the inner conductor, in the space between the conductors, and outside the outer conductor.
b. Draw a graph of B versus r from to if
Radio astronomers detect electromagnetic radiation at 45 MHz from an interstellar gas cloud. They suspect this radiation is emitted by electrons spiraling in a magnetic field. What is the magnetic field strength inside the gas cloud?
The two insulated wires in FIGURE P29.42 cross at a angle but do not make electrical contact. Each wire carries a current. Points are each from the intersection and equally distant from both wires. What are the magnitude and direction of the magnetic fields at points ?
The wire is broken on the right side of the circuit in FIGURE Q28.3. What is the potential difference between points ? Explain.
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