Q: It may have occurred to you that since parallel currents attract,
It may have occurred to you that since parallel currents attract, the current within a single wire should contract into a tiny concentrated stream along the axis. Yet in practice the current typically...
See AnswerQ: A current I flows to the right through a rectangular bar of
A current I flows to the right through a rectangular bar of conducting material, in the presence of a uniform magnetic ï¬eld B pointing out of the page (Fig. 5.56). (a) I...
See AnswerQ: A plane wire loop of irregular shape is situated so that part
A plane wire loop of irregular shape is situated so that part of it is in a uniform magnetic ï¬eld B (in Fig. 5.57 the ï¬eld occupies the shaded region, and points perpen...
See AnswerQ: A circularly symmetrical magnetic field (B depends only on the distance
A circularly symmetrical magnetic ï¬eld (B depends only on the distance from the axis), pointing perpendicular to the page, occupies the shaded region in Fig. 5.58. If the total ï&...
See AnswerQ: Calculate the magnetic force of attraction between the northern and southern hemispheres
Calculate the magnetic force of attraction between the northern and southern hemispheres of a spinning charged spherical shell (Ex. 5.11). [Answer: (π/4)μ0σ 2ω2 R4.]
See AnswerQ: Consider the motion of a particle with mass m and electric charge
Consider the motion of a particle with mass m and electric charge qe in the ï¬eld of a (hypothetical) stationary magnetic monopole qm at the origin: / (a) Find the acceleration of qe,...
See AnswerQ: Use the Biot-Savart law (most conveniently in the form
Use the Biot-Savart law (most conveniently in the form of Eq. 5.42 appropriate to surface currents) to ï¬nd the ï¬eld inside and outside an inï¬nitely long...
See AnswerQ: The magnetic field on the axis of a circular current loop (
The magnetic field on the axis of a circular current loop (Eq. 5.41) is far from uniform (it falls off sharply with increasing z). You can produce a more nearly uniform field by using two such loops a d...
See AnswerQ: Use Eq. 5.41 to obtain the magnetic field on
Use Eq. 5.41 to obtain the magnetic field on the axis of the rotating disk in Prob. 5.37(a). Show that the dipole field (Eq. 5.88), with the dipole moment you found in Prob. 5.37, is a good approximatio...
See AnswerQ: Prove that the divergence of a curl is always zero. Check
Prove that the divergence of a curl is always zero. Check it for function va in Prob. 1.15.
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