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A long straight wire of radius R carries a current distributed uniformly over its cross-section. Then
I. The magnitude of the magnetic field is minimum at the axis and maximum of the surface of the wire
II. The magnetic field at a distance x from the axis of conductor $B α x$ for $0 \leq x \leq R$ and $B α \frac{1}{x}$ for x > R.
III. The $B v / s x$ graph is

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I, II

II, III

I, III

I, II, III

answer is D.

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