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A cylindrical wire of radius \( \mathrm{R} \) is carrying current \( \mathrm{i} \) uniformly distributed over its cross-section. If a circular loop of radius ' \( r \) ' is taken as amperian loop, then the variation value of \( \oint \vec{B} . \mathrm{d} \bar{\ell} \) over this loop with radius ' \( r \) ' of loop will be best represented by:
(A) \( \oint \vec{\beta} \cdot \overrightarrow{d \ell} \)
(C)
(B) \( \oint \overrightarrow{\mathrm{B}} \cdot \overrightarrow{\mathrm{d} \ell} \)
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