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A toroid has a mean radius R equal to 20...

A toroid has a mean radius `R` equal to `20/pi` cm, and a total of 400 turns of wire carrying a current of `2.0 A`. An aluminium ring at temperature `280 K` inside the toroid provides the core. (a) If the magnetization `I` is `4.8 xx 10^(-2) A m^(-1)`, find the susceptibility of aluminium at `280 K`. (b) If the temperature of the aluminium ring is raised to `320 K`, what will be the magnetization?

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