Ok how much energy will I need

  • Thread starter physicsismylife
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In summary, the conversation discusses the possibility of creating an invisibility cloak using magnetic fields or other methods such as manipulating light waves. The idea is met with skepticism and suggestions for alternative projects, such as constructing a "cloaking device" with fiber optics. The technical and practical challenges of creating an invisibility cloak are also acknowledged.
  • #1
physicsismylife
Well I was a registered user here before and something obviously messed up?

Anyway, I am working on this physics project and decided I want to warp the light around an object of some sort to make it appear invisible from the front.

I've been thinking about how to actually pull this off, and the only concern I have is the amount of energy I will need for this and to create a safe barrier between the object the class I am presenting.

Any idea's?
 
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  • #2
Yea, first off your best bet is to use a super massive magnetic field, and the amount of power would be astronomical, and the object wouldn't appear invisible, it would just show up as a dark spot, or a blurred mess, because the object is reflecting light, not producing it.
 
  • #3
Magnetic fields don't bend light.

You'd have to create a black hole to do what you describe.

Good luck getting that past the administrators.

- Warren
 
  • #4
Chroot you are correct that magnetic fields don't bend light, but they can change the path of light. Which is what our experimenter here is trying to do.
 
  • #5
Originally posted by MrCaN
Chroot you are correct that magnetic fields don't bend light, but they can change the path of light.
Wrong.

- Warren
 
  • #6
Hmm, yes a black hole would be convieniant(sp?) but I do not have the supplies to pull one off.

I was under the impression if I pul copper coil around the object and produce a strong electric field I could warp the light around it... or maybe warp space-time itself.
 
  • #7
Originally posted by physicsismylife
I was under the impression if I pul copper coil around the object and produce a strong electric field I could warp the light around it... or maybe warp space-time itself.
Stop reading science fiction.

- Warren
 
  • #8
What do you mean wrong, I have to question if you have studied EM at all, its not a hard connection to make, a light wave is made from both a magnetic field and a electric field, and by definition all magnetic fields will interact to one another.
 
  • #9
I don't read science fiction.
 
  • #10
Originally posted by MrCaN
What do you mean wrong, I have to question if you have studied EM at all, its not a hard connection to make, a light wave is made from both a magnetic field and a electric field, and by definition all magnetic fields will interact to one another.
So I see you've studied electromagnetism long enough to understand that light is a wave phenomena in the electic and magnetic fields. Perhaps you should study a bit more.

- Warren
 
  • #11
Ok Chroot, I don't want to get into a flame war so I will try to say this in small words so that you can understand. Magnetic fields can change the vacuum index, and bend the light. Now I will admit, that only correctly polarized light is effected, but like I stated earlier magnetic fields can bend light. here is a link to an interesting paper on the subject as it occurs around magnestars http://www.cita.utoronto.ca/~shaviv/preprints/lens.pdf [Broken]
 
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  • #12
Uhm guys, I still have to pull this off...
 
  • #13
Uh, good luck buddy.

- Warren
 
  • #14
Really, the closest thing I have to this is the manufacture of a new material that "flips" the field of light and causes refraction in the opposite direction to what is expected.

http://www.centredaily.com/mld/centredaily/news/5523920.htm

But as too what you want to do, I really wouldn't. If you can pull it off, a nobel prize is waiting. But I'd switch projects if I were you.
 
  • #15
What u want isn't plausible in a classroom setting.
 
  • #16
"Cloaking devices" have been constructed with fiber optics. While the technical, engineering, and practical concerns are probably beyond your means, you could demonstrate the idea with a clever arrangement of mirrors. A simple arrangement (which could be improved) would look like:

Code:
    | |
+---+ |
|/   /|
|     |
|  ***|
|     |
|\   \|
+---+ |
    | |

The diagonal lines represent mirrors, the +, -, and | symbols are the walls of your box, and the * are where you can place an object. The illusion will obviously only happen when a person is looking directly into the tunnel on the end, but it would still look nifty!

Hurkyl
 

What is energy?

Energy is the ability to do work or cause change. It can come in many forms, such as light, heat, or motion.

How is energy measured?

Energy is measured in joules (J) or kilojoules (kJ). Other common units of energy include calories (cal) and kilocalories (kcal).

How do I calculate the amount of energy I need?

The amount of energy needed depends on the task or activity you are performing. To calculate the energy needed, you can use the equation E = m x c^2, where E is energy, m is mass, and c is the speed of light.

What factors affect the amount of energy required?

The amount of energy required can be affected by factors such as the type of activity, intensity, duration, and individual factors like age and physical fitness.

How can I increase my energy levels?

To increase your energy levels, it is important to maintain a healthy diet and get enough sleep. Regular physical activity can also help increase energy levels by improving overall physical fitness and reducing stress levels.

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