Consider a straight piece of length \( x \) of a wire carrying a current \( i \). Let \( P \) be...

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Consider a straight piece of length \( x \) of a wire carrying a current \( i \). Let \( P \) be a point on the perpendicular bisector of the piece, situated at a distance \( d \) from its middle point. Show that for \( d>>x \), the magnetic field at \( P \) varies as \( 1 / d^{2} \) whereas for  \( d<<x \) it varies at math xmlns=http://www.w3.org/1998/Math/MathMLmn1/mnmo//momid/mi/math
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