A long copper tube of inner radius R car...

A long copper tube of inner radius `R` carriers a current `i`. The magnetic field `B` inside the tube is

`(mu_(0)i)/(2piR)`

`(mu_(0)i)/(4piR)`

`(mu_(0)i)/(2R)`

Zero

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The correct Answer is:

Magnetic field inside the hollow conductor (tube) is zero.

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