A solenoid is another form of electromagnet. It's an electromagnetic tube generally used to move a piece of metal linearly. Find a drinking straw or an old pen (remove the ink tube). Also find a small nail (or a straightened paper clip) that will slide inside the tube easily. Wrap 100...
How does an electric field produce a magnetic field? How to create a magnetic field without electricity. How is a magnetic field produced in an atom? How can a magnetic field produce an electric current? How does moving a magnetic field create an electric field?
Static electricity or ESDis an electrical charge at rest. This is created by an imbalance of electrons that stay on a specific surface, or in the environmental air. The imbalance of electrons is caused by absence or surplus of electrons. This creates an electrical field that is capable of in...
In 1960, physicist Robert Bussard proposed an interstellar ramjet that would collect charged particles in space via an electromagnetic field, converge them, create a fusion reaction and use the energy for propulsion [sources: Long; NASA]. Read More Frequently Asked Questions What are the ...
In an electrical circuit, if the voltage of the source is increased, more current is forced through the resistance. If the resistance is lowered, more current will flow even if the voltage of the source doesn't change. Even connecting wires in a circuit have resistance, so when high ...
Nanotechnology is an emerging field that gained significant attention in recent years. A series of nanoparticles (NPs) have been already developed with a variety of potential applications [173]. The most common group of nanoparticles are based on metal such as silver, copper and gold. The propert...
We're learning more about the craving that fuels self-defeating habits—and how new discoveries can help us kick the habit.
(3) Rotating Rectifiers: Conversion of AC Current to DC Current – These rectify the AC current generated by the exciter windings and convert it to DC current. This DC current is fed to the rotor / armature to create an electromagnetic field in addition to the rotating magnetic field of the...
Just as in a TEM, the top of a SEM is a powerful electron gun that shoots an electron beam down at the specimen. A series of electromagnetic coils pull the beam back and forth, scanning it slowly and systematically across the specimen's surface. Instead of traveling through the specimen,...
There's a huge amount of theory around electron orbitals, but to understand light there is just one key fact to understand: An electron has a natural orbit that it occupies, but if you energize an atom, you can move its electrons to higher orbitals. A photon is produced whenever an ...