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A long cylindrical conductor of radius R = 3cm carries a uniformly distributed current, I, through its cross section, perpendicular to the plane of the paper. The magnetic field, B, at a distance r = 8 cm from the axis is 35 uT in a clockwise sense.

A) how large is the current?

B) How large is B at r = 1cm?

C)how large is B at r = 5cm?

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