A circular coil carrying a certain current produces a magnetic field B_0 at its center. The coil ...

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A circular coil carrying a certain current produces a magnetic field B_0 at its center. The coil is now rewound so as to have 3 turns and the same current is passed through it. The new magnetic field at the centre is
a. B_0 / 2
b. 9  B_0
c. B_0 / 3
d. 3  B_0

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