A concept map with a main circle titled “A magnet”. There are three supporting circles. Circle a branches out directly off the main circle, and is empty. To other circles branch off from this, one is empty, the other states “a moving electric charge.” You will have to identify the following:

• A magnet is surrounded by (a?) that can exert a force on a moving electric charge.
• A magnet is surrounded by (a?) that, if changing can induce (b?)