Magnetic field due to currentHard

Question

Find the magnitude and direction of a force vector acting on a unit length of a thin wire, carrying a current I = 8.0A, at a point O, if the wire is bent as shown in Figure (i) the curvature radius R = 10 cm. Figure (ii) the distance between the long parallel segments of the wire I = 20 cm. F1 = force vector due to figure (i) F2 = force vector due to figure (ii)
              (i)                 (ii)

Options

A.F1 = 0.20 mN/m
B.F2 = 0.13 mN/m
C.F1 = 0.13 mN/m
D.F2 = 0.20 mN/m

Solution

For ve acting on unit length = B0I

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