A system of long four parallel conductors whose sections with the plane of the drawing lie at the vertices of a square there flow four equal currents The directions of these currents are as follows those marked ox point away from the reader, while those marked with a dot point towards the reader How is the vector of magnetic induction directed at the centre of the square?
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Answer

in the plane of the drawing from right to left

Explanation

`oversetrarr(B_(O)) = oversetrarr(B_(A)) + oversetrarr(B_(B)) + oversetrarr(B_(C))
+oversetrarr(B_(D))`
`B_(o)` towards right to left
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