In a region of space where the magnetic field is circular but $J$ is zero, what is $B_{\varphi}$ (if $C$ is some constant)?
A) $C / u^{2}$
B) $\mathrm{Clu}$
C) zero
D) $\mathrm{Cu}$
E) $\mathrm{Cu}^{2}$
F) None of the above

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The Answer of In a region of space where the magnetic field is circular but $J$ is zero, what is $B_{\varphi}$ (if $C$ is some constant)?
A) $C / u^{2}$
B) $\mathrm{Clu}$
C) zero
D) $\mathrm{Cu}$
E) $\mathrm{Cu}^{2}$
F) None of the above

In a Region of Space Where the Magnetic Field Is JJJ

In a Region of Space Where the Magnetic Field Is $J$