A current i ampere flows along an infinitely long straight thin walled tube , then the magnetic induction at any point inside the tube is

infinite

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zero

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\frac{μ_{0}}{4 π} . \frac{2 i}{r} t e s l a

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\frac{2 i}{r} t e s l a

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Solution

The correct option is B zero
Using ampers law, there is no current enclosed in the pipe
$\int ¯ ¯¯ ¯ B \cdot ¯ ¯¯¯ ¯ d l = μ_{o} I e n c l o s e d$

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