本题目来源于试卷: Magnetism Magnetism，类别为 IB物理学
[问答题]
A type of magnetic swmj: p 9og8qvc j/neb+1ixy* 0h9oyjl9zgrgg2 5 tch similar to a solenoid is a relay . A relay is an electromagnet (the iron rod inside the coil does not move) which, when activated, attracts a piece of iron on a pivot. Design a relay to close an electrical switch. A relay is used when you need to switch on a circuit carrying a very large current but you do not want that large current flowing through the main switch. For example, the starter switch of a car is connected to a relay so that the large current neede5ojg9*g y x ylhzg920rd for the starter doesn’t pass to the dashboard switch.
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