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## Homework Statement:

- The current through the cylindrical conductor s I. Its cross sectional area is pi.a^2. Now, the two cavities on the figure above can be thought of as conductors carrying a current I' into the plane of the paper, where;

## Relevant Equations:

- I'= [I/(pi.a^2)].pi.[a/2]^2

How can I' be the formula above? Is there any formula to get this same