1. Tardigrade
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  3. Physics
  4. For a cylindrical conductor of radius a, which of the following graphs shows a correct relationship of B versus r ?

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Q. For a cylindrical conductor of radius $a$, which of the following graphs shows a correct relationship of $B$ versus $r$ ?

Moving Charges and Magnetism

Solution:

For a cylindrical conductor for $r< a, B \propto r$ and for $r >a, B \propto(1 / r) .$ So, graph (c) is correct.