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Magnetic Field Due to a Circular Ring on the Axis

The magnetic ...

Question

The magnetic flux density B at a distance r from a long straight wire carrying a steady current varies with r as

A

linearly

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B

exponentially

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C

inversely

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D

none of these

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Solution

The correct option is A inversely
I am not able to see the options.
Magnetic flux density at a distance r from the straight wire is given by
$B = μ_{o} i / 2 π r$
Therefore, varies inversely.

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Magnetic Field Due to a Circular Ring on the Axis

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