Two circular coils 1 and 2 are made from the same wire but the radius of the 1 st coil is twice ...

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Two circular coils 1 and 2 are made from the same wire but the radius of the 1 st coil is twice that of the 2 nd coil. What is the ratio of potential difference applied across them, so that the magnetic field at their centres is the same?
(a) 3
(b) 4
(c) 6
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