Consider a coaxial cable which consists of an inner wire of radius \( a \) surrounded by an oute...

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Consider a coaxial cable which consists of an inner wire of radius \( a \) surrounded by an outer shell of inner and outer radii \( b \) and \( c \), respectively. The inner wire carries a current \( I \) and the outer shell carries an equal current in opposite direction.
\( P \)
(a) for \( xa, B=\frac{\mu_{0} I x}{2 \pi a^{2}} \)
(b) for \( axb, B=\frac{\mu_{0} I}{2 \pi x} \) (c) Both are correct
(d) Both are wrong
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