A wire A , bent in the shape of an arc o...

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

`4:6`

`6:4`

`6:5`

`2:5`

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