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If a current i ampere flows in a long st...

If a current i ampere flows in a long straight thin walled tube, then magnetic induction at any point inside the tube is

A

infinite

B

zero

C

`(mu_(0))/(4pi).(2I)/r`

D

`(2I)/r`

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The correct Answer is:
B
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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-IA
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