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unscientific
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Homework Statement
This question is about entropy of magnetic salts. I got up to the point of finding H1, the final applied field.
The Attempt at a Solution
But instead of doing integration I used this:
dS = (∂S/∂H)*dH
= (M0/4α)(ln 4)2
I removed the negative sign because they wanted decrease in S.
I know integration is the sure-fire way to get Sinitial - Sfinal but why is this method wrong? Is it because this method is only an approximation?