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A circular coil carrying a certain curre...

A circular coil carrying a certain current produces a magnetic field `B_(0)` at its centre.The coil is now rewound so as to have 3 turns and the same current is psses through it.The new magnetic field at the centre is

A

`B_0/3`

B

`3B_0`

C

`B_0/9`

D

`9B_0`.

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