If a bar magnet doesn’t have any marking, an easy way to tell which is north and

If a bar magnet doesn’t have any marking, an easy way to tell which is north and — If a bar magnet doesn’t have any marking, an easy way to tell which is north and Определить расположение полюсов у постоянных магнитов

Все фотографии: Определить расположение полюсов у постоянных магнитов