A circular loop A of radius R carries current I.Another circular loop B of radius r=R/20 concentric

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A circular loop A of radius R carries a current I. Another circular loop B of
radius r=R/20 is placed concentrically in the plane of A. The magnetic
flux linked with loop B is proportional to
(A) R
(C) RI
(B) R
(D) R?
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