For the magnetic field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must be.......$^o$
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(b) The magnetic field due to small element of conductor of length is given by $dB = \frac{{{\mu _0}}}{{4\pi }}\frac{{Idl\sin \theta }}{{{r^2}}}$
This value will be maximum when
$\sin \theta = 1 = \sin 90^\circ $ or, $\theta = 90^\circ $
This value will be maximum when
$\sin \theta = 1 = \sin 90^\circ $ or, $\theta = 90^\circ $
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