Solved: PHYSICS Question for NEET

NEET PHYSICSMedium

From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field in the inside and outside region of the wire is

Uniform and remains constant for both the regions.

A linearly increasing function of distance upto the boundary of the wire and then linearly decreasing for the outside region.

A linearly increasing function of distance $r$ upto the boundary of the wire and then decreasing one with $\frac{1}{r}$ dependence for the outside region.

A linearly decreasing function of distance upto the boundary of the wire and then a linearly increasing one for the outside region.

Step-by-Step Solution

Inside the wire ( $r < R$ ), the magnetic field $B = \frac{\mu_0 I r}{2 \pi R^2}$ , which is linearly increasing with $r$ . Outside the wire ( $r > R$ ), the magnetic field $B = \frac{\mu_0 I}{2 \pi r}$ , which is proportional to $\frac{1}{r}$ .

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