Title: Необов'язково

Text: When the wire is pushed to the left, we would expect that the magnet must feel a push to the right. (Otherwise we could put the whole thing on a wagon and have a propulsion system that didn't conserve momentum!) Although the force is too small to make movement of the bar magnet visible, a more sensitively supported magnet, like a compass needle, will show the movement. Кожен абзац буде тестом.

Save test: Використовуйте це, якщо ви хочете поділитися цим тестом на друкування (тільки для автентифікованих користувачів).