A wire carrying current
I is laid in shape of a curve which is represented in plane polar coordinate system as,
r=b+cπθ for 0≤θ≤π2 Here
b and
c are positive constants.
θ is the angle measured with respect to positive
X direction in anticlockwise sense and
r is the distance from origin (see figure). The magnetic field at the origin due to the wire is found to be
μoIxcln(1+cyb) The value of xy is
![](https://search-static.byjusweb.com/question-images/byjus/ckeditor_assets/pictures/765994/original_2Q.png)