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JEEMAIN PAST PAPERS
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2004
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Q)
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 ) $\frac{\mu_0}{4 \pi} \frac{2i}{r} tesla$
( B ) $ \frac{2i}{r} tesla$
( C ) infinite
( D ) zero
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