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Thomas Moore, a professor of physics at Pomona College in Claremont, California, uses the principle of relativity to demonstrate why Faraday's Law, which states that a changing magnetic field creates an electric current, is true."Since this is the core principle behind transformers and electric generators, anyone who uses electricity is experiencing the effects of relativity," Moore said. When a direct current (DC) of electric charge flows through a wire, electrons are drifting through the material.
Meanwhile, from the electrons' perspective, the protons in both wires look like they are moving.
Because of the relativistic length contraction, they appear to be more closely spaced, so there's more positive charge per length of wire than negative charge.
White light is a mix of all the colors of the rainbow, but in gold's case, when light gets absorbed and re-emitted the wavelengths are usually longer.
That means the mix of light waves we see tends to have less blue and violet in it.
But you don't necessarily need a spaceship zooming at near the speed of light to see relativistic effects.
In fact, there are several instances of relativity that we can see in our daily lives, and even technologies we use today that demonstrate that Einstein was right. Magnetism is a relativistic effect, and if you use electricity you can thank relativity for the fact that generators work at all.Electrons in the inner orbitals carry energy that is closer to the energy of outer electrons, and the wavelengths that get absorbed and reflected are longer.[Sinister Sparkle Gallery: 13 Mysterious & Cursed Gemstones]Longer wavelengths of light mean that some of the visible light that would usually just be reflected gets absorbed, and that light is in the blue end of the spectrum.Since like charges repel, the two wires also repel.Currents in the opposite directions result in attraction, because from the first wire's point of view, the electrons in the other wire are more crowded together, creating a net negative charge.Meanwhile, the protons in the first wire are creating a net positive charge, and opposite charges attract.In order for your car's GPS navigation to function as accurately as it does, satellites have to take relativistic effects into account.[9 Cool Facts About Magnets]Assuming the currents are moving in the same direction, the electrons in the first wire see the electrons in the second wire as motionless.(This assumes the currents are about the same strength).Any object in a big gravity field is accelerating, so it will also experience time dilation.Meanwhile, the astronaut's spaceship will experience length contraction, which means that if you took a picture of the spacecraft as it flew by, it would look as though it were "squished" in the direction of motion.