本题目来源于试卷: Magnetism Magnetism，类别为 IB物理学
[问答题]
A type of magnetic sqmvw0kdc ugh/u589x8 , m;uj lwitch similar to a solenoid is a).t rvmug*a-z relay . A relay is an electromagnet (the iron rod inside the coil dzu .*g- vta)mroes 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 needed for the starter doesn’t pass to the dashboard switch.
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