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The Magic Cafe Forum Index » » Not very magical, still... » » Don't Fight Club (0 Likes) Printer Friendly Version

critter
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Inner circle
Spokane, WA
2551 Posts

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Welcome to Don't Fight Club.

The First rule of Don't Fight Club is we do not talk about religion or politics.
The Second rule of Don't Fight Club is we do NOT TALK about religion or politics.
The Third rule... If someone yells "Stop!", goes limp, or taps out, they're at the wrong place. Fight Club is down the hall.
The Fourth rule of Don't Fight Club is to leave your negativity at the door.
"The fool is one who doesn't know what you have just found out."
~Will Rogers
Marlin1894
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565 Posts

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MobilityBundle
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Las Vegas/Boston
120 Posts

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Okay, so... ummm...

Suppose you have two long straight wires that each have the same uniform charge distribution on them. Suppose they're parallel and separated by a distance that's small compared to the length of the wire. Since they have the same charge distribution, and like charges repel, there will be a certain electrostatic force that tends to push these wires apart.

Now suppose the wires are moving in a straight line along their axes, and in the same direction. Moving charge is the same as an electric current. An electric current will generate a magnetic field that depends on the speed of the current, and that magnetic field will tend to attract the wires together.

Q: How fast do the wires have to be moving in order for the electrostatic repulsion to exactly balance the magnetic attraction?

A: The speed of light.

Whoah....
PaulPacific
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Yes, I used my toes to type all of my
890 Posts

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OMG Get a load of that sweater!
Blessings on thee, little man,
barefoot boy with cheeks of tan...
Outward sunshine; inward joy,
Blessings on thee, barefoot boy! :-D
Marlin1894
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565 Posts

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Quote:
OMG Get a load of that sweater!


Bill Cosby must have had a garage sale.
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