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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,for0 r (c)B=0,for,0 (d)B=0,only for x=0

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

Grade:12

1 Answers

Nirmal Singh.
askIITians Faculty 44 Points
10 years ago
we know at any distance x eqn is
B x = miyu0* i
where i is current enclosed in loop of radius r
since it is thin walled so current is just at surface i.e at distance r
so for x<r there will be no current and there is no B
so C is answer

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