Magnetism: Attract and repent

AsSalyamu `Aleykum wa RahmatuLlahi wa Barakatuh,

Equipment: piece of string, card, 2 magnets and piece of clay.

Notes:

1. We have to attach one magnet with clay to our card

2. Tie with piece of a string another magnet.

3. Bring it close on a string to another magnet

When we put south to south you could feel them repel each other (which we show on the picture but picture did not turn out as good as you would be able to see). But when we put south to north they attract and come together.