A wire A, bent in the shape of an arc of a circle, carrying a current of 2A and having a radius of 2cm and another wire B, also bent in the shape of an arc of a circle, carrying a current 3A and having a radius of 4cm, are placed as shown in the figure. The ratio of the magnetic fields due to the wires A and B at the common center O is:
Option: 1 4:6
Option: 2 6:4
Option: 3 2:5
Option: 4 6:5
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