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A circular loop has radius R and a current I flows through it.

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A circular loop has radius R and a current I flows through it. Another circular loop has radius 2R and a current 21 flows through it. Ratio of the magnetic fields at their centres is-

(a) 1/4 

(b) 1 

(c) 2 

(d) 4

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Correct answer is (b) 1

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