A long straight wire of circular cross-section (radius a) is carrying steady current I. The current I is unifo…

Question

A long straight wire of circular cross-section (radius **$$a$$**) is carrying steady current **$$I$$**. The current **$$I$$** is uniformly distributed across the cross-section. The magnetic field is:

Accepted Answer

C. Directly proportional to $$r$$ in the region $$r < a$$ and inversely proportional to $$r$$ in the region $$r > a$$

Answer

A. Zero in the region $$r < a$$ and inversely proportional to $$r$$ in the region $$r > a$$

Answer

B. Inversely proportional to $$r$$ in the region $$r < a$$ and uniform throughout in the region $$r > a$$

Answer

D. Uniform in the region $$r < a$$ and inversely proportional to $$r$$ in the region $$r > a$$

Answer & step-by-step solution

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