a circular coil of wire of radius r has n turn and carries a current l the magnitude induction (B) at a point on the axis of the coil at at a distance 2root2r from its center will be
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Explanation:
B=2(a2+x2)3/2nμ0ia2
=2(r2+3r2)3/2nμ0Ir2
=2×8×r3nμ0Ir2
=16rμ0nI
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