A) is zero at all points
B) to zero only at its mide point
C) has different magnitudes at different points
D) is maximum at its midpoint
Correct Answer: C
Solution :
The section AB and CD produce field in the same direction at all points on BC. The magnitude of the field is variable being a function of the distance from AB and CD. At the midpoint of BC, the magnetic field. \[B=2\times \frac{{{\mu }_{0}}I}{4\mu \left( \frac{d}{2} \right)}=\frac{{{\mu }_{0}}I}{\pi d}\]
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