HWK37s_11G

# HWK37s_11G - electric ﬁeld(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 ﬁeld (i.e. in the same direction as the ﬁeld if the charge is +, and in the opposite direction if the charge is -). The force on a moving charged particle due to a magnetic ﬁeld is perpendicular to both the magnetic ﬁeld and to the particle’s velocity. Remember, a charged particle must be moving in order to feel a force due to a magnetic ﬁeld. 25. If a piece of iron is placed in a current carrying coil, the magnetic ﬁeld strength will be greatly increased inside the coil. The ﬁeld due to the coil puts the spins in the iron into alignment. The newly aligned spins give rise to a magnetic ﬁeld which reinforces the original ﬁeld. 1...
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