Tire magnetic field at point P due to current I in AB is, BAB=
µ0I
4πr
⊗ The magnetic field at point P due to current I in BC is, BBC=0 (As the point P is along the BC) The magnetic field at point P due to current I in A'B' is BA′B′=
µ0I
4πr
⊗ The magnetic field at point P due to current I in B'C' is, BB′C′=0 (As the point P is along the BC) ∴ The net magnetic field at P is, B=BAB+BBC+BA′B′+BB′C′ =