[itex]\frac{Ns-L}{L+Ns}[/itex](adsbygoogle = window.adsbygoogle || []).push({});

What does that reduce to if L << Ns ? Obviously setting L to zero leads me nowhere since that argument above is actually inside a logarithm. I don't know how to perform the approximation. And the answer can't be zero by the way. Is there something I can do here? Usually the only approximations I've done before are just expansions but this is already expanded.

Thank you.

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# How do I carry out an approximation for this equation?(if L Ns then what?)

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