An infinite long thin cylinder of radius R is carrying current I. Arrange the magnitude of magnetic field in decreasing order

B at r = 3R/2

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B at r = R/2

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B at r = 2R

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B at r = 5R/2

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Solution

Inside the hollow part of the cylinder the magnetic field is zero (an amperian loop encloses no current) and outside the cylinder the magnetic field is the same as that from a long straight wire placed on the axis of the cylinder:
B = $μ I / 2 π r$

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An infinite long thin cylinder of radius R is carrying current I. Arrange the magnitude of magnetic field in decreasing order

Inside the hollow part of the cylinder the magnetic field is zero (an amperian loop encloses no current) and outside the cylinder the magnetic field is the same as that from a long straight wire placed on the axis of the cylinder: B = μI/2πr

Inside the hollow part of the cylinder the magnetic field is zero (an amperian loop encloses no current) and outside the cylinder the magnetic field is the same as that from a long straight wire placed on the axis of the cylinder:
B = $μ I / 2 π r$