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Find the magnetic field at the centre of...

Find the magnetic field at the centre of the circular loop shown in figure.

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Magnetic field at the point O due to infinite wire is `(mu_(0)i)/(2piR)` out of the plane.
Magnetic field at the point O due to circular loop is `(mu_(0)i)/(2piR)` out of the plane.
Magnetic field at the point O due to circular loop is `(mu_(0)i)/(2R)` into the plane.
Thus net field `=(mu_(0)i)/(2R)[1/(pi)hatk-hatk]=(mu_(0)i)/(2R)[1/(pi)-1]hatk=(mu_(0)i)/(2R)((pi-1)/(pi))(-hatk)`
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AAKASH INSTITUTE ENGLISH-MOVING CHARGE AND MAGNESIUM-SECTION D
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