Electric Susceptibility
Electric Susceptibility - Related Videos
03:18
Stimulation of the Intracardiac Nervous System to Assess Susceptibility to Arrhythmia
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2025
Source: Jungen, C., et al. Impact of Intracardiac Neurons on Cardiac Electrophysiology and Arrhythmogenesis in an Ex Vivo Langendorff System. J. Vis. Exp. (2018).The video demonstrates an ex vivo technique for stimulating the intracardiac nervous system to assess the heart’s susceptibility to arrhythmia. Using a perfusion apparatus, an isolated mouse heart is perfused with an oxygenated buffer. The intracardiac nervous system is then stimulated at a high frequency to induce arrhythmias.
01:09
Quantitative Susceptibility Mapping of a Human Brain Using Ex-Vivo Magnetic Resonance Imaging
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2025
Quantitative susceptibility mapping, or QSM, quantifies the magnetic susceptibility of brain tissue, which reflects its cellular composition, like myelin content.Begin by acquiring ex-vivo magnetic resonance imaging or MRI data of a fixed human brain hemisphere.Use 3D gradient magnetic fields to magnetize the tissue and collect signals at multiple time points or echoes to reduce background noise and artifacts and enhance the signals.Generate phase maps for all echoes, ensuring the removal of...
08:28
Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
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Cited by 3 •
2011
Techniques for measurement of electrical activity of the heart by electrocardiogram (ECG), and analysis of cardiac risk factors and susceptibility to arrhythmias following status epilepticus (SE) in the rat are described.
06:50
Electric Potential
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Electric potential, also known as "voltage", measures the electric potential energy per unit charge. Electric field is a scalar quantity and is fundamental to many electrical effects. Like potential energy, what is physically meaningful is the difference in the electric potential. For example, the spatial variation in the electric potential is related to the electric...
01:31
Magnetic Susceptibility and Permeability
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2025
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material. When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
FAQs
Two microscopic responses can contribute to polarization: bound charges may shift relative to one another, while permanent dipoles may reorient toward the applied field. Their combined response determines how strongly the material polarizes. Distinguishing these contributions helps physicists connect material-level charge behavior with the observed dielectric response.
In a linear medium, polarization changes proportionally with the electric field, allowing susceptibility to appear as a constant proportionality factor in P = ε₀χₑE. Isotropy means the response does not depend on field direction. When these conditions do not apply, susceptibility may vary with direction or require a more general description.
Electric susceptibility can vary with the frequency of the applied field because the material’s polarization response may change as the field oscillates. Frequency-dependent behavior provides information about dielectric dispersion, meaning variation in response, and absorption. Studying these effects helps relate dynamic electromagnetic behavior to the underlying charge and dipole response.
Physicists compare susceptibility values to assess how readily different dielectric materials develop polarization under comparable electric fields. These comparisons support predictions of dielectric response, capacitance, and energy-storage behavior. The values therefore provide a common, dimensionless basis for relating material polarization to macroscopic electromagnetic performance.
A material’s susceptibility helps characterize how its polarization responds inside an electric-field-based system. That dielectric response can then inform predictions of capacitance and energy storage. Consequently, susceptibility connects microscopic charge displacement or dipole alignment with practical electrical behavior, allowing dielectric materials to be evaluated for systems that store electric energy.
Susceptibility is useful in sensors and optical devices because it links a material’s microscopic polarization behavior to measurable macroscopic electromagnetic properties. Its dependence on frequency and direction can also reveal how the material responds under different operating conditions. This makes it a relevant descriptor when interpreting or designing dielectric responses in device contexts.