A long straight wire, having a radius greater than $$4.0\ \text{mm}$$, carries a current that is uniformly distributed over its cross-section. The magnitude of magnetic field $$B$$ due to the current is $$0.28\ \text{mT}$$ at $$r=4.0\ \text{mm}$$ and $$0.20\ \text{mT}$$ at $$r=10.0\ \text{mm}$$, respectively, from the axis of the wire. Then the

A

magnitude of the magnetic field at $$r=2.0\ \text{mm}$$ is $$0.14\ \text{mT}$$

B

magnitude of the magnetic field at $$r=5.0\ \text{mm}$$ is greater than that at $$r=6.0\ \text{mm}$$

C

current flowing in the wire is $$I=20\ \text{A}$$

D

current density in the wire is $$J\approx1.1\times10^5\ \text{A m}^{-2}$$