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Current flows through a straght thinwalled tube of radius r. The magnetic field at a distance x from the axis of the tube has magnitude B.
(a)B∞x,for 0 (b)B∞1/x,for0r (c)B=0,for,0 (d)B=0,only for x=0
(b)B∞1/x,for0r
(c)B=0,for,0 (d)B=0,only for x=0
(d)B=0,only for x=0
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