Question

Ring magnets in the image are repelling each other. If top face of blue ring magnet is north pole, then the poles of the bottom face of red magnet and top face of yellow magnet should be _____ and _____ respectively.

• A.
  south, south
• B.
  north, south
• C.
  north, north
• D. south, north

Answer 1

The correct option is B

north, south
1. Like poles of magnet repel each other. So, bottom face of red magnet and top face of blue magnet should have the same pole. So, the bottom face of red magnet is also north pole.
2. If the top face of the blue magnet is the north pole, then its bottom must be the south pole. Because it is repelling the yellow magnet, its top face is also a south pole.