A circular coil carrying a certain curre...

A circular coil carrying a certain current produces a megnetic field `B_(o)` at its centre. 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

`3B_(0)`

`B_(0)/3`

`B_(0)/9`

`9B_(0)`

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