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Not a constant electric current but a changing one will generate electromagnetic waves.
First: If you have a lone electron, and it is accelerated in any way, it will send off an electromagnetic wave. This is because a changing electric field generates a magnetic field.
It is also true that changing magnetic field will generate an electric field. This is the reason that if you have an electric current, which is generating a magnetic field, and you change the current you generate an electromagnetic wave. To generate a continuous sinusoidal electromagnetic wave you continuously change the current sinusoidally.
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ViviYes, an electric current can generate an electromagnetic wave. When an electric current flows through a conductor, it creates a magnetic field around the conductor. This changing magnetic field then generates an electromagnetic wave, which consists of oscillating electric and magnetic fields propagating through space.
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What starts the vibration of the electric and magnetic fields in an electromagnetic wave?
The vibration of the electric and magnetic fields in an electromagnetic wave is initiated by a changing electric current or an accelerating electric charge. When these occur, the varying electric and magnetic fields interact and propagate through space in the form of an electromagnetic wave.
Is it possible to transmit electricity as electromagnetic waves?
Well, when you transmit something as an electromagnetic wave, it is no longer an electric current, since an electromagnetic wave doesn't involve movement of charges. However, you can convert electrical energy into an electromagnetic wave, transfer that, and then convert it back to an electric current at the receiving end.
Is an electric field associated with an electromagnetic wave constant in time?
Yes, in a vacuum an electromagnetic wave has a constant electric field amplitude. This field oscillates in time as the wave propagates.
What type of wave is EM radiation?
Electromagnetic radiation consists of waves that are composed of oscillating electric and magnetic fields and do not require a medium to propagate. This type of wave is considered a transverse wave, with electric and magnetic fields perpendicular to the direction of propagation.
What is the direction of propagation of an electromagnetic wave?
An electromagnetic wave propagates in a direction perpendicular to both the electric and magnetic fields.
