A wire of one metre length carries a constant current. The wire is bent to form a circular loop. The magnetic field at the centre of this loop is B.The same is now bent to form a circular loop of smaller radius having four turns. The magnetic field at the centre of this new loop will be

Options

(a) B/2
(b) 4B
(c) B/4
(d) 16B

Correct Answer:

16B

Explanation:

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