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A solenoid has a core of a material with...

A solenoid has a core of a material with relative permeability 400. The windings of the solenoid are insulated from the core and carry of 2A. If the number of turns is 1000 per metre, calculate B.

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Magnetisation is given by
`M = (B - mu_(0)H)//mu_(0)`
`= (mu_(r) mu_(0) H - mu_(0)H)//mu_(0) = (mu_(r) - 1) H = 399 xx H ~= 8 xx 10^(5) A//m`
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