Magnetic flux Φ = bxs, Φ is scalar, B and s are vectors. How can I determine the direction of S

S has two directions (forward and backward). These two directions are not definite, but are supposed to be beneficial to solving the problem according to the meaning of the problem
If B and s have the same direction, then Φ is positive; otherwise, the quantity Φ is negative
Hope to help you

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