At the centre of a fixed large circular coil of radius r
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Step-by-step explanation:
The magnetic field at the centre of a circular coil carrying current is
B = mu(0) n I / (2r)
Where mu(0) is the permeability of free space, n is the number of turns in the coil, I the current in the coil and r it's radius.
It should be easy enough to get the answer you want.
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