A)
B)
C)
D)
Correct Answer: A
Solution :
Magnetic field inside a conductor [if \[r\le a\]] \[{{B}_{in}}=\frac{{{\mu }_{0}}I}{2\pi {{a}^{2}}}.\,\,r\] or \[{{B}_{in}}\propto r\] and magnetic field outside the conductor [if \[r\ge a\]] \[{{B}_{out}}=\frac{{{\mu }_{0}}I}{2\pi r}\] \[B\propto \frac{1}{r}\] Hence, graph [a] is correct.
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