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EX3: Non-Constant Conductivity I

Problem 48:

Equation (5.3) may be regarded as a quadratic equation in the quantity . Solving for will yield two expressions, only one of which should be physically valid. Determine the correct solution by examining the limiting behavior as of each of the expressions for .

[HINT: A Taylor approximation for when is small, helps in evaluation of the limits.]

Look here for .

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