{"id":21836,"date":"2019-07-22T18:48:52","date_gmt":"2019-07-22T22:48:52","guid":{"rendered":"https:\/\/www.myedme.com\/login\/?p=21836"},"modified":"2019-07-30T16:54:40","modified_gmt":"2019-07-30T20:54:40","slug":"chapter-10-introduction-to-electromagnetism-and-electromagnetic-waves","status":"publish","type":"post","link":"https:\/\/myedme.com\/login\/chapter-10-introduction-to-electromagnetism-and-electromagnetic-waves\/","title":{"rendered":"Chapter 10. Electromagnetism and Electromagnetic Waves\u00a0"},"content":{"rendered":"\n

If you want to look at the questions now, you can click here<\/a>. <\/p>\n\n\n\n

In the 1800s scientist began to better understand how\nelectricity and magnetism were connected. At this time, travelers used a compass\nwhich pointed to the north pole. Scientists began to see that their electrical\ncircuits would change where a compass pointed. A surprising discovery! This observation<\/em> was important but it did not\nshow the theory<\/em> that connected\nelectricity and magnetism.<\/p>\n\n\n\n

Electricity flowing through a wire creates magnetic fields.\nThese fields can attract other objects. As electricity flowed, then the wire\nwould become magnetic. These magnetic fields may be hard to imagine, but if you\nlet metal settle over time you can see the fields. The experiment described\nbelow shows the fields created by a rare earth magnet.<\/p>\n\n\n\n

Now, scientist talk about electricity and magnetism\ntogether, so they study \u201celectromagnetism.\u201d You have been studying\nelectromagnetism this whole time!<\/p>\n\n\n\n

Electromagnetism is the big idea behind observations about\nelectric currents and magnetic forces. A changing electric field creates\nmagnetism. And, changing magnetic fields will create an electric field. These\nfields move creating waves of electromagnetism. It\u2019s impossible to separate\nelectricity from magnetism!<\/p>\n\n\n\n

Waves\nof energy have very different sizes!<\/strong><\/p>\n\n\n\n

Electromagnetic waves are different than ocean waves or\nsound waves. Waves that you can see and hear need to move water or air to\ntravel. These waves need to be in something. Electromagnetic waves can be\nanywhere, even space (which is big and empty)! These waves have a photon. There\nis no matter in a photon, just energy. These little packets of energy move in\nwaves across the universe, and even across your eyeball right now! <\/p>\n\n\n\n

These waves can be as small as 1 millionth of a millimeter (0.0000000001 millimeters!). We use small waves like these to take X-rays. Other waves can be 100 meters long. We use long waves like these to send AM radio over long distances. Your FM radio uses waves that are between 1 and 10 meters long. The length of a wave makes it useful for different things. <\/p>\n\n\n\n

\"\"
These NASA pictures of the same spiral galaxy show how different cameras capture different electromagnetic waves. The cameras can capture infrared, visible light, and x-ray waves. <\/figcaption><\/figure><\/div>\n\n\n\n

Radios are a good example of how electricity and magnetism are examples of electromagnetic waves. The radio waves are electromagnetic waves. These waves are created by electricity flowing into a transmitter antenna which makes electrons vibrate up and down it, producing radio waves. Then, the radio waves move electrons in your radio\u2019s antenna. (Yes, your car has a radio antenna, even if you can\u2019t see it!). Your radio uses these moving electrons to understand the sounds sent by the radio tower. This is how your radio creates music!<\/p>\n","protected":false},"excerpt":{"rendered":"

If you want to look at the questions now, you can click here. In the 1800s scientist began to better understand how electricity and magnetism were connected. At this time, travelers used a compass which pointed to the north pole. Scientists began to see that their electrical circuits would change where a compass pointed. A […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-21836","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/posts\/21836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/comments?post=21836"}],"version-history":[{"count":3,"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/posts\/21836\/revisions"}],"predecessor-version":[{"id":22724,"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/posts\/21836\/revisions\/22724"}],"wp:attachment":[{"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/media?parent=21836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/categories?post=21836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/myedme.com\/login\/wp-json\/wp\/v2\/tags?post=21836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}