The ”Buttonhole stitch” is a variation of the chain stitch. It is commonly used in embroidery for finishing edges or creating decorative borders. In this stitch, the needle is inserted in a looped manner similar to chain stitch, but it is more structured and often used to create a raised or outlined effect, making it more rigid compared to the chain stitch.
Draw the pattern of the magnetic field lines for the two parallel straight conductors carrying current of same magnitude 'I' in opposite directions as shown. Show the direction of magnetic field at a point O which is equidistant from the two conductors. (Consider that the conductors are inserted normal to the plane of a rectangular cardboard.)