Question: The diagram below illustrates a reciprocal principle satisfied by an ohmic sample of any shape. The principle asserts that if the impressed currents satisfy I

The diagram below illustrates a reciprocal principle satisfied by an ohmic sample of any shape.

I (a) V + V 2 (b) 3 40 I

The principle asserts that if the impressed currents satisfy IA = IB, the measured voltages satisfy VA = VB.
Prove this by evaluating the integral

in two different ways. Assume that the current enters and exits the sample at delta function sources and sinks.

I (a) V + V 2 (b) 3 40 I

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