How the field of a thick wire with uniform current varies with distance from its axis

1. A.
   $B \propto r^{2}$
2. B.
   $B \propto r$
3. C.
   $B \propto \frac{1}{r^{2}}$
4. D.
   $B \propto \frac{1}{r}$

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1. A.
   Zero in the region $r < a$ and inversely proportional to $r$ in the region $r > a$
2. B.
   Inversely proportional to $r$ in the region $r < a$ and uniform throughout in the region $r > a$
3. C.
   Directly proportional to $r$ in the region $r < a$ and inversely proportional to $r$ in the region $r > a$
4. D.
   Uniform in the region $r < a$ and inversely proportional to distance $r$ from the axis, in the region $r > a$

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1. A.
   Option (A)
2. B.
   Option (B)
3. C.
   Option (C)
4. D.
   Option (D)

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