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 \[r\to \infty \]
Correct Answer: B
Solution :
From Biot-Savart's law, \[dB=\frac{{{\mu }_{0}}}{4\pi }\frac{Idl}{{{r}^{2}}}\] i.e.\[dB\propto \frac{1}{{{r}^{2}}}\]
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