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

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A current I ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is .
A. infinite
B. zero
C. `(mu_(0)22i)/(4pi r)T`
D. `(mu_(0)iT)/(2r)`
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Correct Answer - D
For a point in side the tube using ampere law
`int B.dI=mu_(0)i`
Therewe have i=0 for inside the tube B=0
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