A) greater than in wire c
B) less than in wire c
C) equal to that in wire c
D) not comparable to that of in wire c doc to tack of information
Correct Answer: B
Solution :
Inside the wire \[B\left( r \right)=\frac{{{\mu }_{0}}}{2\pi }\frac{I}{{{R}^{2}}}r\Rightarrow \frac{dB}{dr}=\frac{{{\mu }_{0}}}{2\pi }\frac{I}{{{R}^{2}}}r\] i.e., slope \[\propto \frac{1}{\pi {{R}^{2}}}\propto \]Current density
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