Two long parallel conductors carry currents in opposite directions as shown. One conductor carries a current of 10 A and the distance between the wires is d = 10 cm. Current I is adjusted, so that the magnetic field at P is zero. P is at a distance of 5 cm to the right of the 10 A current. Value of I is :

Options

A. 40 A
B. 30 A
C. 20 A
D. 0.41666666666667

Answer

B