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Chapter 32: Q31P (page 969)
In New Hampshire the average horizontal component of Earth鈥檚 magnetic field in 1912 was , and the average inclination or 鈥渄ip鈥� was . What was the corresponding magnitude of Earth鈥檚 magnetic field?
The magnitude of the earth鈥檚 magnetic field is
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Figure 32-22a shows a pair of opposite spins orientations for an electron in an external magnetic field. Figure 32-22b gives three choices for the graph of the energies associated with those orientations as a function of the magnitude. Choices b and c consist of intersecting lines and choice of parallel lines. Which is the correct choice?
In Fig. 32-43, a bar magnet lies near a paper cylinder. (a) Sketch the magnetic field lines that pass through the surface of the cylinder. (b) What is the sign of for every area on the surface? (c) Does this contradict Gauss鈥� law for magnetism? Explain.
A parallel-plate capacitor with circular plates of radius is being charged. At what radius (a) inside and (b) outside the capacitor gap is the magnitude of the induced magnetic field equal toof its maximum value?
The figure shows a circular region of radius in which an electric flux is directed out of the plane of thepage. The flux encircled by a concentric circle of radius r is given by, where andt is in seconds. (a)What is the magnitude of the induced magnetic field at a radial distance ? (b)What is the magnitude of theinducedmagnetic field at a radial distance?
Question: Figure 32-35a shows the current i that is produced in a wire of resistivity . The magnitude of the current versus time is = 10.0A is shown in Figure b. The vertical axis scale is set by ts= 50.0ms and the horizontal axis scale is set by . Point P is at radial distance 9.00 mm from the wire鈥檚 centre. (a) Determine the magnitude of the magnetic field at point P due to the actual current i in the wire at t= 20 ms, (b) At t = 40 ms, and (c) t = 60 ms . Next, assume that the electric field driving the current is confined to the wire. Then Determine the magnitude of the magnetic field at point P due to the displacement current id in the wire at (d) t = 20 ms , (e) At t = 40 ms , and (f) At t= 60 ms . At point P at 20 s, what is the direction (into or out of the page)of (g) and (h) ?
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