{"id":404,"date":"2020-04-16T19:53:47","date_gmt":"2020-04-16T19:53:47","guid":{"rendered":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/?page_id=404"},"modified":"2026-05-11T05:52:45","modified_gmt":"2026-05-11T05:52:45","slug":"electrons","status":"publish","type":"page","link":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/exhibits\/em\/electrons\/","title":{"rendered":"Electron Beam"},"content":{"rendered":"

Electron Beam<\/h1>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n\n
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\"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n
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The apparatus is a vessel containing a low pressure gas. A voltage of 10,000 volts produces a discharge in the gas. Electrons are separated from the atoms of the gas and are accelerated toward the positive anode.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

A beam of electrons passes through the slit and is made visible by allowing it to hit the slanted glowing ribbon.<\/p>\n\n\n\n

What can we see?<\/u><\/p>\n\n\n\n

    \n
  1. See the bright green stripe produced by the electron beam hitting the fluorescent ribbon.<\/li>\n\n\n\n
  2. Notice the pale green stripe where the electron beam; strikes the glass envelope.<\/li>\n\n\n\n
  3. See how the electron beam widens as it travel toward the right, this is because electrons repel each other.<\/li>\n<\/ol>\n\n\n\n

    Use the horse shoe magnet so that its jaws straddle the electron beam.<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    What’s changes?<\/p>\n\n\n\n

      \n
    1. The electron bean is bent by the magnetic field of the magnet<\/li>\n\n\n\n
    2. Reverse the horse shoe magnet; see how the electron beam is bent in the opposite direction<\/li>\n\n\n\n
    3. Try other positions of the magnet, observe the effects.<\/li>\n<\/ol>\n\n\n\n

      The force bending the electron beam is the Lorentz force,<\/p>\n\n\n\n

      \"\"<\/figure>\n\n\n\n

      where q is the charge, is the velocity and is the strength of the magnetic field.<\/p>\n\n\n\n

       <\/p>\n\n\n\n

      The direction of the force can be found using the right hand rule as shown here:<\/p>\n\n\n\n

      \"\"<\/figure>\n\n\n\n

      Physics Lecture Demonstration Database<\/a> <\/b><\/i><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

      The apparatus is a vessel containing a low pressure gas. A voltage of 10,000 volts produces a discharge in the gas. Electrons are separated from the atoms of the gas and are accelerated toward the positive anode. A beam of electrons passes through the slit and is made visible by allowing it to hit the …<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":63,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uw_migration_status":"complete","_uw_gutenberg_post_content_before_migration":"","_uw_seo_meta_title":"","_uw_seo_meta_description":"","_uw_seo_twitter_card_type":"","_uw_seo_meta_image":"","_uw_seo_meta_image_url":"","_uw_seo_meta_image_sizes":[],"_uw_seo_custom_meta_tags":[],"footnotes":""},"class_list":["post-404","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages\/404","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/comments?post=404"}],"version-history":[{"count":5,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages\/404\/revisions"}],"predecessor-version":[{"id":950,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages\/404\/revisions\/950"}],"up":[{"embeddable":true,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages\/63"}],"wp:attachment":[{"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/media?parent=404"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}