HWK37s_11G - electric eld (i.e. in the same direction as...

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HWK 37 (SOLUTIONS) (due 4/26/07) Read chp. 36 sections 4-7 Do 8, 10, 11, 13, 25 8. A piece of iron has domains; regions of aligned spins. Since the domains are randomly aligned, their magnetic fields, on average, cancel out. When an external magnetic field is applied to the iron (either from a current or from a magnet), many spins are forced into alignment giving rise to a magnetic field. The iron is now magnetized. 10. The magnetic field lines of a field due to a current carrying wire form concentric circles about the wire. 11. The right hand rule will show you that the magnetic field lines from all parts of the wire loop reinforce each other inside the loop. 13. The force on a charged particle due to an electric field is parallel to the
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Unformatted text preview: electric eld (i.e. in the same direction as the eld if the charge is +, and in the opposite direction if the charge is -). The force on a moving charged particle due to a magnetic eld is perpendicular to both the magnetic eld and to the particles velocity. Remember, a charged particle must be moving in order to feel a force due to a magnetic eld. 25. If a piece of iron is placed in a current carrying coil, the magnetic eld strength will be greatly increased inside the coil. The eld due to the coil puts the spins in the iron into alignment. The newly aligned spins give rise to a magnetic eld which reinforces the original eld. 1...
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