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Chapter 29: Q50P (page 861)
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.
The magnitude of the magnetic field inside the solenoid is
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A surveyor is using a magnetic compass below a power line in which there is a steady current of .(a) What is the magnetic field at the site of the compass due to the power line? (b) Will this field interfere seriously with the compass reading? The horizontal component of Earth鈥檚 magnetic field at the site is role="math" localid="1663130453654" .
In Figure, five long parallel wires in an xyplane are separated by distance, have lengths ofand carry identical currents ofout of the page. Each wire experiences a magnetic force due to the other wires. In unit-vector notation,(a) What is the net magnetic force on wire 1, (b) What is the net magnetic force on wire 2, (c) What is the net magnetic force on wire 3, (d) What is the net magnetic force on wire 4, and (e) What is the net magnetic force on wire 5?
The magnitude of the magnetic field from the axis of a long straight wire is. What is the current in the wire?
An electron is shot into one end of a solenoid. As it enters the uniform magnetic field within the solenoid, its speed is and its velocity vector makes an angle of with the central axis of the solenoid. The solenoid carries and has along its length. How many revolutions does the electron make along its helical path within the solenoid by the time it emerges from the solenoid鈥檚 opposite end? (In a real solenoid, where the field is not uniform at the two ends, the number of revolutions would be slightly less than the answer here.)
Figure 29-52 shows, in cross section, four thin wires that are parallel, straight, and very long. They carry identical currents in the directions indicated. Initially all four wires are atfrom the origin of the coordinate system, where they create a net magnetic field .(a) To what value of xmust you move wire 1 along the xaxis in order to rotate counter clockwise by ? (b) With wire 1 in that new position, to what value of xmust you move wire 3 along the xaxis to rotate byback to its initial orientation?
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