Field Direction
Field Direction - Related Videos
11:15
Electric Field-controlled Directed Migration of Neural Progenitor Cells in 2D and 3D Environments
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Cited by 22 •
2012
This protocol demonstrates methods used to establish 2D and 3D environments in custom-designed electrotactic chambers, which can track cells in vivo/ex vivo using time-lapse recording at the single cell level, in order to investigate galvanotaxis/electrotaxis and other cellular responses to direct current (DC) electric fields (EFs).
04:46
Changing the Direction and Orientation of Electric Field During Electric Pulses Application Improves Plasmid Gene Transfer in vitro
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Cited by 2 •
2011
Gene transfection by electroporation is improved approximately two times when orientation of electric field is changed during pulse application, while cell viability is not affected. The increase in gene transfection is caused by the increase of the membrane area which is made competent for DNA entry into the cell.
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...
10:23
Electric Fields
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN An electric field is generated by a charged object (referred to as the source charge) in the space around it, and represents the ability to exert electric force on another charged object (referred to as the test charge). Represented by a vector at any given point in the space, the electric field is the electrical force per unit test charge placed at that point (the force...
11:00
A Galvanotaxis Assay for Analysis of Neural Precursor Cell Migration Kinetics in an Externally Applied Direct Current Electric Field
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Cited by 26 •
2012
In this protocol we demonstrate how to construct custom chambers that permit the application of a direct current electric field to enable time-lapse imaging of adult brain derived neural precursor cell translocation during galvanotaxis.
FAQs
At a chosen point, the field vector gives the local orientation directly, while a field line supplies the same directional information through its tangent at that point. This distinction matters when the field changes across space: the relevant direction is determined locally rather than assigned as one uniform orientation to the entire region.
Electric-field direction uses a defined reference: imagine the force acting on a positive test charge placed at the point of interest. This convention turns an abstract vector into an interaction-based interpretation, allowing diagrams and calculations to indicate how the electric influence acts locally without depending on an unspecified charge choice.
Magnetic-field direction follows a different reference convention from the electric case. Its orientation is identified using the force convention for a north magnetic pole. Keeping that reference explicit prevents the directional meaning of a magnetic-field representation from being confused with the electric-field convention based on a positive test charge.
Comparing directions at multiple points reveals how a field is organized through space. A set of local orientations can show whether the influence maintains a consistent direction or changes from place to place. This spatial comparison supports visualization of field structure in both experimental observations and theoretical models.
To determine field direction, first identify the point being analyzed, then obtain the field vector or inspect the tangent to the field line there. For electric fields, interpret the result through the force on a positive test charge; for magnetic fields, use the north-pole force convention. The chosen procedure matches the field type.
Field direction helps predict how particles may move because it identifies the local way an influence acts. It also supports analysis of interactions, where the orientation at a particular location matters rather than only the field's presence. These uses connect directional information to interpreting physical behavior in experiments and models.
The same directional reasoning extends beyond electric and magnetic examples. Gravitational fields and fluid-flow fields can also be examined by considering how their influence is oriented at specific locations. Including these systems broadens the use of field direction as a way to interpret spatial patterns in physical experiments and theoretical descriptions.