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A steady current I is passing through a long wire of radius R (solid wire). If the current is distributed uniformly across the cross - sectional area of the wire, than

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Magnetic field increases linearly from center to surface

Magnetic field at centre of wire is non - zero

Magnetic field falls off inversaly with distance r from center of wire for r > R

Magnetic field at centre of wire is zero.

answer is A, B, C.

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Detailed Solution

The variation of B with r for solid current carrying wire · ( uniform distribution of current across the cross - section of wire) is shown below

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