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A very long, hollow cylinder (radius 3.1cm) is formed by rolling up a thin sheet of...

A very long, hollow cylinder (radius 3.1cm) is formed by rolling up a thin sheet of copper. Electric charges flow along the copper sheet parallel to the axis of the cylinder. The arrangement is, in effect, a hollow tube of current 1.5A. Use Ampère’s law to find the magnetic field (a) outside the cylinder at a distance 4.2cm from the axis and (b) inside the cylinder at a distance 0.75cm from the axis. (Hint: For closed paths, use circles perpendicular to and centered on the axis of the cylinder.)

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Answer #1

a R= Mo I (48x167) (1.8) 20 (0.042) = 17.14x106T Con 7.14 MT) b) For r<R [.. no current is enclosed

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