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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

A

B

C

D

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The correct Answer is:
A
Magnetic field inside the hollow metallic cylinder `B_(i n)=0`, and magnetic field outside it `B_(out) prop 1/r`
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