What happens to the potential energy of a stationary charge when it begins?
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Asked in Electricity and Magnetism
Does a stationary charge produce a magnetic field?
Asked in Physics, Electrostatics
What happens to the potential energy of a stationary charge when it begins to move freely from one point to another under the influence of an electric field?
The potential energy of the particle goes down just as its kinetic energy, which results from the particle's increasing motion, increases - thereby conserving the total energy of the system. Of course these terms refer ONLY to the potential energy due to the charged particle's presence in an electric field and its change in motion in the direction of that field. If there were also a gravitational field present and the particle had mass, it would have also have potential (and kinetic, if it's falling too) energy from that field, independently of the electric field.
Asked in Economics
What happens to a monopolistically competitive firm that begins to charge an excessive price for its product?
Asked in Electrostatics
Why is static electricity considered to be a charge and not a current?
Asked in Economics
What happens to a monopolistically competitive firm that begins to charge an excessive price for it's product?
What is defined as potential energy per unit charge?
Asked in Electronics
What happens to charge and potential difference and capacitance in the presence of dielectric when the battery is disconnected from the capacitors?
Asked in Physics
Why is it that when electric potential energy is low the electric potential is high?
Asked in Consumer Electronics, Physics
Can you find the potential difference when the charge is moving with external force?
Asked in Physics
What kind of field surrounds a stationary electric charge?
The potential energy per unit of electric charge is called?
Asked in Science, Electrostatics
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Amount of electric potential energy per one coulomb of charge?
Asked in Energy
Can electric potential energy be negative?
Electric potential energy absolutely can be negative. Before I attempt to explain it, make sure to recognize that electric potential and electric potential energy are two different but very closely related concepts. Electric potential (measured in Volts or Joules per Coulomb) is a measure of the potential energy of of a test charge of q=1C in an electric field (produced by a point charge, point charge distribution, or continuous charge distribution). Electric potential at a point distance r from a source point charge (charge=Q) is simply: V=kQ/r. Notice V at the point will be positive for a source point charge of positive polarity and negative for a source point charge of negative polarity. Electric potential energy and electric potential are measured over a distance d as they are the measure of the difference of electric potential or electric potential energies in space from point a in an electric field to point b in an electric field. Usually you will see the equation for electric potential energy of a movable charge written as (Ub-Ua=q(Vb-Va)) where Ub and Vb are the electric potential energy and electric potential respectively at point b, Ua and Va are the electric potential energy and electric potential respectively at point a, and q is the charge of the movable charge . We can easily set point a to lay at infinity, and the U and V at infinity are zero. This reduces the above equation for electric potential energy of a movable charge to U=qV. With that equation in mind, we can see two situations when the electric potential energy could be negative: either the polarity of the movable charge is positive while the source charge is negative, or the movable charge is negative while the source charge is positive! Now that I've justified negative electric potential energies mathematically, let's think about it conceptually. Electric potential energy is the energy transferred to a movable charge from an electric field if the charge were released and allowed to fly out to infinity. If the polarity of the source of the electric field has the same polarity as the movable charge, the potential energy will be positive as there would be a repulsive force between the two charges. However, if the two polarities were not the same, the source charge and movable charge would be attracted to each other. It would actually take an input of energy to move that particle out to infinity, and therefore that movable charge possesses a negative electric potential energy!
What is the effect of a magnetic field on a stationary electric field?
The magnetic field will have no effect on a stationary electric charge. ( this means that the magnetic field is also stationary. ) If the charge is moving , relative to the magnetic field then there might be an effect, but the size and direction of the effect will depend on the direction of the electric charge as it moves through the field. If the charge is moving parallel to the field there will be no effect on it. If the charge is moving at right angles to the field then it will experience a force that is mutually orthogonal to the field and direction of the motion. You really need diagrams to properly explain this
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Asked in Human Anatomy and Physiology
Why is the term action potential used to describe a nerve impulse?
It is a difference in charge supplied by ion position. In resting potential the tendency is for the inside of the cell membrane to have a negative ionic charge, while the outside of the membrane has a positive charge. The change, back and forth in these two charge potentials is the conduction of charge down the neuron and is called the action potential.