A straight wire carrying a current of 12 A is bent into a semi-circular arc of radius 2.0 cm as shown in Fig. (a).
Consider the magnetic field B at the centre of the arc.
(i) What is the magnetic field due to the straight segments?
(ii) In what way the contribution to B from the semicircle differs from that of a circular loop and in what way does it resemble?
(iii) Would your answer be different if the wire were bent into a semi-circular arc of the same radius but in the opposite way as shown in Fig. (b)?