Questions
Figure shows a current loop having two circular arcs joined by two radial lines. Find the magnetic field B at the centre O.
detailed solution
Correct option is A
As the point O is on the line AD, the magnetic field at O due to AD is zero. Similarly, the field at O due to BC is also zero. The field at the centre of a circular current loop is given by . The field due to the circular arc BA will be .
The right-hand thumb rule shows that the field is coming out of the plane of the figure. The field due to the circular arc DC is .
Going into the plane of the figure. The resultant field at O is
coming out of the plane.
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