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Two toroids 1 and 2 have total number of...

Two toroids 1 and 2 have total number of turns 200 and 100 respectively with average radii 40cm and 20cm respectively. If they carry same current ` i`, the ratio of the magnetic fields along the two loops is
(a) 1:1
(b) 4:1
(c) 2:1
(d) 1:2

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