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A long straight hollow metallic tube carrying a current l has three sections of different area of cross section as shown in figure. Three points A, B and C are on a line parallel to the axis of the tube. If magnetic field at this point are `B_1`, B_2`, B_3` respectively, then

A

`B_3gtB_1gtB_2`

B

`B_3ltB_1ltB_2`

C

`B_1=B_2=B_3`

D

`B_1=B_3gtB_2`

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