A) \[{{0}^{o}}\]
B) \[{{90}^{o}}\]
C) \[{{180}^{o}}\]
D) \[{{45}^{o}}\]
Correct Answer: B
Solution :
From Biot-Savart's law, the magnetic field \[d\vec{B}\] at P due to the current element idl is given by \[dB=\frac{{{\mu }_{0}}}{4\pi }\frac{idl\,\sin \,\theta }{{{r}^{2}}}\] where \[\theta \] is angle between id \[\vec{l}\] and \[\vec{r}\]. Maximum value of sin \[\theta =1,\]when \[\theta ={{90}^{o}}\]. Hence, for magnetic field to be maximum the angle is \[{{90}^{o}}\].You need to login to perform this action.
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