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1 EET 103 / EET 105 Chapter 4 Magnetic Circuits. Magnetic Fields In the region surrounding a permanent magnet there exists a magnetic field, which can. - ppt download
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![Electronic apparatus for biological research . Figure 4.2 More lines of force are brought into being if they are provided with a path of low magnetic resistance or 'reluctance' to travel Electronic apparatus for biological research . Figure 4.2 More lines of force are brought into being if they are provided with a path of low magnetic resistance or 'reluctance' to travel](https://c8.alamy.com/comp/MA7BP0/electronic-apparatus-for-biological-research-figure-42-more-lines-of-force-are-brought-into-being-if-they-are-provided-with-a-path-of-low-magnetic-resistance-or-reluctance-to-travel-in-thus-if-a-closed-ring-or-core-of-iron-or-iron-compound-be-provided-nearly-all-the-flux-is-found-to-lie-in-the-magnetic-circuit-so-produced-and-to-be-proportional-to-a-factor-called-the-permeability-of-the-iron-often-of-the-order-of-100-or-1000-and-inversely-proportional-to-the-length-of-the-magnetic-circuit-figure-42-iron-ixkni-ik-magnetic-ohms-lawif-we-compare-the-equation-above-MA7BP0.jpg)