1. The problem statement, all variables and given/known data A conductor carrying current ‘I’ is in the form of a semicircle AB of radius ‘R’ and lying in the x-y plane with its centre at origin as shown in the figure. Find the magnitude of ∫B.dl for the circle 3x2 +3z2 =R2 in the x-z plane due to curve AB. Ans (1-√3/2)μ0I 2. Relevant equations 3. The attempt at a solution Applying Ampere’s Law ∫B.dl= μ0I for the closed loop i.e the given circle ∫B.dl turns out to be zero since there is no current flowing through the loop .But this is incorrect . I would be grateful if somebody could help me with the problem.