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The image shows a coaxial cable (two nested cylinders) of length l, inner radius a and outer radius b. Note that l >> a and l >> b. The inner cylinder is charged to +Q and the outer cylinder is charged to −Q.

a) The cable carries a current I, which flows clockwise. Use Ampere’s Law to calculate the magnetic field B at r < a, a < r < b, and r > b.

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