Question on the Vector document, page 2, second graph. The bottom side of parallelogram has vector B that has a direction from left to right and the top side as a vector with the same direction and magnitude. Why is the top side labeled -B? I think it should be B.

Question

Question on the Vector document, page 2, second graph.  The bottom side of parallelogram has vector B that has a direction from left to right and the top side as a vector with the same direction and magnitude.  Why is the top side labeled -B?  I think it should be B.

phi · Answer

They wanted to show -B,  but put the arrow on the wrong end.