Question

The magnetic field due to a current in a straight wire segment of length \(\mathrm{L}\) at a point on its perpendicular bisector at a distance \(r(r>>L)\)
(A) decreases as \(\frac{1}{r}\)
(B) decreases as \(\frac{1}{r^{2}}\)
(C) decreases as \(\frac{1}{r^{3}}\)
(D) approaches a finite limit as \(r \rightarrow \infty\)

Answer 1

Ans(B)
(By Biot-Savart's law \(\mathrm{dB} \propto \frac{1}{r^{2}}\) )

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