Why do you need that roll of black tape?

The tape serves no purpose in the experiment besides holding the compass in the air, so the field and the direction of force can be observed in a three-dimensional manner, both above and below the compass.

That's really interesting. Why does it do that, though? I've been thinking and I haven't come up with anything.

Primarily due to the magnetic field s or more commonly known as poles correct me if i am wrong i am only in the 8th grade

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Physics library

Course: Physics library > Unit 18

Lesson 5: Discovery of electromagnetism

Electromagnetic field (above vs. below)

Name: Electromagnetic field (above vs. below)
Uploaded: 2013-05-03T13:24:19Z
Description: Testing the direction of force when the current carrying wire is above vs. below a compass. What does this tell us?

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Testing the direction of force when the current carrying wire is above vs. below a compass. What does this tell us? Created by Brit Cruise.

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annesophie98
Posted 10 years ago. Direct link to annesophie98's post “Does anyone know if there...”
Does anyone know if there's a video about Lorentz force? I couldn't find one in the electromagnetism section.
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- matthewmccarthy0331
  Posted 8 years ago. Direct link to matthewmccarthy0331's post “i don't think so but you ...”
  i don't think so but you can look at the top where it says search subjects, skills and videos.
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mohak mansharamani
Posted 9 years ago. Direct link to mohak mansharamani's post “how strong magnetic field...”
how strong magnetic field can an electromagnet produce when given a power of 1 watt?
also how big/small object can it attract??
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tyleekgt
Posted 8 years ago. Direct link to tyleekgt's post “I believe that the scienc...”
I believe that the science discovery kahn videos should have more voices or how to's to engage the learner to pay more attention. Does anyone agree?
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- raineeee
  Posted 7 years ago. Direct link to raineeee's post “I think it's supposed to ...”
  I think it's supposed to be a DIY experiment intro.
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Ishita Gupta
Posted 7 years ago. Direct link to Ishita Gupta's post “If the wire has an insula...”
If the wire has an insulator plastic around it, how does the field pass through the thick coating then?
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Tiny tim
Posted 10 years ago. Direct link to Tiny tim's post “Why do you need that roll...”
Why do you need that roll of black tape?
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- Jared Popowski
  Posted 9 years ago. Direct link to Jared Popowski's post “The tape serves no purpos...”
  The tape serves no purpose in the experiment besides holding the compass in the air, so the field and the direction of force can be observed in a three-dimensional manner, both above and below the compass.
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  (4 votes)
Jack McClelland
Posted 10 years ago. Direct link to Jack McClelland's post “Does it matter the order ...”
Does it matter the order that you connect the wires to the battery terminals?
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(2 votes)
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- Flanny
  Posted 9 years ago. Direct link to Flanny's post “Actually, that does matte...”
  Actually, that does matter. As you can see in the next video, the compass will rotate the other way.
  https://www.khanacademy.org/science/discoveries-projects/discoveries/Electromagnet/v/electromagnetic-field--forward-vs--reverse
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Venkata Sai Ram
Posted 9 years ago. Direct link to Venkata Sai Ram's post “should there be a large c...”
should there be a large current flowing through the wire for compass to show deflection
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Jack McClelland
Posted 10 years ago. Direct link to Jack McClelland's post “That's really interesting...”
That's really interesting. Why does it do that, though? I've been thinking and I haven't come up with anything.
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(1 vote)
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- chris.live220
  Posted 9 years ago. Direct link to chris.live220's post “Primarily due to the magn...”
  Primarily due to the magnetic field s or more commonly known as poles
  
  correct me if i am wrong i am only in the 8th grade
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  (2 votes)
neeral surve
Posted 3 years ago. Direct link to neeral surve's post “please explain how did th...”
please explain how did the direction of rotation of magnetic needle changed ?
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(1 vote)
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Video transcript

clockwise counterclockwise