The figure gives experimentally measured B vs H variation in ferromagnetic material. The ratio of saturation magnetization to retentivity is

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answer is 1.5.

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Detailed Solution

x = retentivity (induced magnetic field at zero applied field); y = coercivity (resistance to demagnetization); z = saturation magnetization (point at which curve tends to become horizontal)r=zx=32=1.5.

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