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Field Effect Transistor01:29

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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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The Possible as a Field of Inquiry.

Vlad Petre Glăveanu1

  • 1Department of Psychology, Webster University Geneva, Geneva, Switzerland.

Europe'S Journal of Psychology
|September 29, 2018
PubMed
Summary

This editorial introduces the possible as a new field in psychology, exploring how to actively engage with future possibilities. Understanding the possible can enhance individual and societal growth.

Area of Science:

  • Psychology and related social sciences.
  • Focus on the emerging field of the possible.

Background:

  • Advances in counterfactual thinking, anticipation, and prospection.
  • Calls to study humans and societies as open systems adaptable to the future.

Discussion:

  • Reviews existing cognitive approaches to the possible.
  • Outlines a new sociocultural account grounded in social ontology.
  • Contrasts cognitive focus on the possible vs. actual with a sociocultural perspective.

Key Insights:

  • The possible requires further theoretical elaboration beyond cognitive processes.
  • A sociocultural approach offers a new framework for understanding the possible.
  • Emphasizes difference, positions, perspectives, reflexivity, and dialogue.
Keywords:
anticipationcounterfactualscreativityimaginationpossiblesociocultural psychology

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Outlook:

  • A deeper understanding of the possible is crucial for cultivating it.
  • Enhancing awareness and exploration of the possible benefits both individuals and society.