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The magnetic field due to a conductor fo...

The magnetic field due to a conductor fo unifrom cross section of radius `a` and carrying a steady current is represented by

A

B

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D

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Magnetic field at a point outside the straight conductor is
`B=(mu_(0)l)/(2pir)`
i.e.B`oo(1//r) (rgta)`.
Magnetic field at a point lying inside the conductor is `Boor(rlta)`.
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