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A thin but long, hollow, cylindrical tu...

A thin but long, hollow, cylindrical tube of radius r carries a current i along its length. Find the magnitude of the magnetic field at a distance r/2 from the surface (a) inside the tube (b) outside the tube.

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Verified by Experts

The correct Answer is:
A, B
(a) loop `(1)`
`B(2pir/2)=mu_(0)(0)`
(b)loop (2)
`B(2pi(5r)/4)=mu_(0)i`
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