Electricity And Magnetism
Electricity And Magnetism - Related Videos
09:12
Electric Charge in a Magnetic Field
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2023
Source: Andrew Duffy, PhD, Department of Physics, Boston University, Boston, MA This experiment duplicates J.J. Thomson's famous experiment at the end of the 19th century, in which he measured the charge-to-mass ratio of the electron. In combination with Robert A. Millikan's oil-drop experiment a few years later that produced a value for the charge of the electron, the experiments enabled scientists to find, for the first time, both the mass and the charge of the electron, which are key...
13:56
The Use of Magnetic Resonance Spectroscopy as a Tool for the Measurement of Bi-hemispheric Transcranial Electric Stimulation Effects on Primary Motor Cortex Metabolism
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Cited by 30 •
2014
This article aims to describe a basic protocol for combining transcranial direct current stimulation (tDCS) with proton magnetic resonance spectroscopy (1H-MRS) measurements to investigate the effects of bilateral stimulation on primary motor cortex metabolism.
13:29
Electric and Magnetic Field Devices for Stimulation of Biological Tissues
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2021
This protocol describes the step-by-step process to build both electrical and magnetic stimulators used to stimulate biological tissues. The protocol includes a guideline to simulate computationally electric and magnetic fields and manufacture of stimulator devices.
08:32
External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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Cited by 9 •
2017
Neuronal cultures are a good model for studying emerging brain stimulation techniques via their effect on single neurons or a population of neurons. Presented here are different methods for stimulation of patterned neuronal cultures by an electric field produced directly by bath electrodes or induced by a time-varying magnetic field.
10:04
Magnetic Fields
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Magnetic fields can be generated by moving charges, such as an electrical current. The magnetic field generated by a current can be calculated from the Maxwell equation. In addition, magnetic objects such as bar magnets can also generate magnetic fields due to microscopic dynamics of charges inside the material. Magnetic fields will exert magnetic force on other moving...
FAQs
Electric and magnetic fields influence charged matter through field interactions. Electric charges establish electric fields, while charge motion contributes magnetic fields. The resulting interactions explain why electrical and magnetic effects cannot always be treated separately, especially in systems containing currents or changing fields. This framework connects static charge behavior with the operation of devices based on coordinated electrical and magnetic effects.
Electromagnetic induction describes how a changing magnetic field produces an electric field. This relationship provides the physical basis for transferring energy between magnetic and electrical forms. It is especially important for understanding generators, where changing magnetic conditions create electrical output, and for interpreting how electrical systems respond when magnetic environments vary over time.
Motors and generators represent complementary uses of electromagnetic interactions. A motor applies electrical and magnetic effects to produce motion, whereas a generator uses changing magnetic conditions to produce an electrical effect. Comparing them shows how energy conversion can proceed in opposite directions while relying on the same field relationships and principles of electricity and magnetism.
Changing electric and magnetic fields are linked dynamically rather than acting as isolated effects. Their relationship provides the physical context for electromagnetic waves, which includes light. This connection extends electricity and magnetism beyond circuits and laboratory apparatus, showing that the same field principles also describe the propagation of energy associated with light and other electromagnetic phenomena.
A useful analysis begins by identifying charges, currents, electric fields, magnetic fields, and any changes occurring with time. Researchers then consider how these quantities interact and whether the system converts energy, produces motion, transmits signals, or responds to changing fields. This approach supports interpretation of circuits, motors, generators, communications systems, and energy technologies.
Applications span electronics, communications, medical imaging, and energy systems. In electronics, the principles help describe circuit behavior; in communications, they support the transmission and interpretation of electromagnetic signals. Medical imaging and energy technologies likewise depend on controlled electrical or magnetic effects. These applications demonstrate how the subject connects field theory with practical devices and infrastructure.
The framework provides tools for research in condensed matter, plasma, and particle physics. In condensed matter, electrical and magnetic behavior can be examined in materials; plasma research considers systems containing charged matter; particle physics studies interactions involving fundamental charged entities. These connections make electricity and magnetism relevant across different scales and research environments within physics.
Circuits provide a setting in which charges and currents can be studied as part of an organized system. Examining their associated fields helps connect circuit behavior with broader electromagnetic principles rather than treating electrical output as an isolated effect. The same understanding supports energy systems, where electrical and magnetic interactions are used to manage energy conversion and delivery.