Help on this question plz! (1 Viewer)

[720YoloSwagScope]

Hey guys

Could someone explain to me why the answer here is B?
How do I tell which magnet is North and which is South?

 

[porcupinetree]

By application of the right hand grip rule, where the fingers are current flow and thumb points to north pole: in B, the left magnet act as a south pole and the right magnet act as a north pole.