The electric current in a circular coil of 2 turns produces a magnetic induction B1 at its centre. The coil is unwound and is rewound into a circular coil of 5 turns and the same current produces a magnetic induction B2 at its centre. The ratio of B2/B1 is
1
\(\frac{5}{2}\)
2
\(\frac{25}{4}\)
3
\(\frac{5}{4}\)
4
\(\frac{25}{2}\)
5
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