https://padlet.com/cnliu/xmt5zmby1so0 Chapter 7 Summary en-us 2017-11-09 18:04:52 UTC 2025-10-15 18:05:56 UTC hello@padlet.com cnliu https://padlet.com/cnliu/xmt5zmby1so0/wish/205417624 Magnetism is one aspect of the combined electromagnetic force.]]> 2017-11-09 18:06:35 UTC https://padlet.com/cnliu/xmt5zmby1so0/wish/205417624 cnliu https://padlet.com/cnliu/xmt5zmby1so0/wish/208320348 2017-11-17 22:51:58 UTC https://padlet.com/cnliu/xmt5zmby1so0/wish/208320348 cnliu https://padlet.com/cnliu/xmt5zmby1so0/wish/208320626 A region of space that surround a magnet and exerts a force on other magnets and objects made of magnetic material.]]> 2017-11-17 22:54:37 UTC https://padlet.com/cnliu/xmt5zmby1so0/wish/208320626 cnliu https://padlet.com/cnliu/xmt5zmby1so0/wish/208321290 More than 2,000 years ago, the Greeks noticed that chunks of the magnetite could attract a piece of iron.
Since the discovery of magnetite, many devices have been developed that rely on magnets.

]]> 2017-11-17 23:02:31 UTC https://padlet.com/cnliu/xmt5zmby1so0/wish/208321290 cnliu https://padlet.com/cnliu/xmt5zmby1so0/wish/208323368 These groups of atoms with aligned magnetic poles.]]> 2017-11-17 23:29:24 UTC https://padlet.com/cnliu/xmt5zmby1so0/wish/208323368 cnliu https://padlet.com/cnliu/xmt5zmby1so0/wish/208324049 Danish physics teacher Hans Christian Oersted found that electricity and magnetism are related.He noticed that the electric current affected the direction of the compass needle. Oersted hypothesized that the electric current must produced a magnetic field depends on the direction of the current.]]> 2017-11-17 23:41:20 UTC https://padlet.com/cnliu/xmt5zmby1so0/wish/208324049 cnliu https://padlet.com/cnliu/xmt5zmby1so0/wish/208325251 The attractive or repulsive  force between electric charges and magnets.]]> 2017-11-18 00:05:02 UTC https://padlet.com/cnliu/xmt5zmby1so0/wish/208325251 cnliu https://padlet.com/cnliu/xmt5zmby1so0/wish/208325476 A temporary magnet created when there is a current in a wire coil]]> 2017-11-18 00:11:01 UTC https://padlet.com/cnliu/xmt5zmby1so0/wish/208325476 cnliu https://padlet.com/cnliu/xmt5zmby1so0/wish/208325632 Speaker
The electromagnet changes electrical energy into the mechanical energy that vibrates the speaker cone to produce the sound that you hear.
Galvanometers
Devices that uses an electromagnet to measure electric current.

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