A long thin hollow metallic cylinder of ...

A long thin hollow metallic cylinder of radius `'R'` has a current `i` ampere. The magnetic induction `'B'` -away from the axis at a distance `r` from the axis varies as shown in

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The correct Answer is:

`B(rlt R)=0`
` B(rgt R)=(mu_(0)i)/(2pir)`

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