A) \[\frac{{{\mu }_{0}}}{2\pi }\]
B) \[\frac{{{\mu }_{0}}}{4\pi }\]
C) \[\frac{{{\mu }_{0}}}{8\pi }\]
D) zero
Correct Answer: D
Solution :
According to Biot-Savart's law - magnetic field at distance r from current carrying conductor is \[dB=\frac{{{\mu }_{0}}}{4\pi }\,\,\frac{Idl\,\sin \theta }{{{r}^{2}}}\] For a point lying on axis of wire \[\theta =0\]. So, magnetic field at any point on the axis \[dB=0\]. (\[\because \] \[\sin \,0=0\])
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