By convention, the North Pole on a magnet is painted which color?

• A. Blue
• B. Green
• C. Yellow
• D. Red

Answer: (D)

Red is used to mark the North-seeking end of a magnet in most teaching and lab contexts. This color-coding—red for the north end and blue for the south end—lets you quickly read polarity and predict how a magnet will orient in an external field. The North-seeking end is the one that points toward geographic north, and using red for that end has become a standard convention so diagrams and hardware stay consistent. The other colors aren’t standard for labeling magnet poles, so they wouldn’t reliably indicate the North end.