Hiro wants to model the magnetic field of a bar magnet using a shoe box and pipe cleaners. He labels the ends of the shoe box N and S. How should he position the pipe cleaners? Choose three correct answers.

Magnetic field lines form continuous loops. Outside the magnet, they leave the north pole and curve around to enter the south pole, so the pipe cleaners should loop over the top, bottom, and sides. Inside the box, they represent the return path from south to north, joining the ends of each loop.

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