Leeyoung
Answered

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In which case or cases is an electric field present?
* A spark jumping betwwen two nearby rods
* A charge that is momentarily at rest
* A dead power line.

Sagot :

LesterDC

Hi Leeyoung,

The answer to your question is all of them has electric field.

For us to understand it, let us know more about electrical field and electrical charges.

An electrical field is a region around an electrically charged particle through which there might be an exertion of electrical force when another charged particle came into close proximity with it.

Electrical field diminishes if the distance from the source of charge is farther. The concept electrical field has been explained by Michael Faraday.

An electric charge on the other hand is a physical property of matter that is being exhibited by its subatomic particles. These particles are known as:

  • Proton  
  • Electron; and
  • Neutron

In chemistry, we all know that a protons carry a positive charge, while electrons carry a negative charge and also neutrons carry no charge. To quantify these identities you may refer to the list below:

Charge of a proton = 1.6 x 10-19 Coulombs

Charge of an electron = -1.6 x 10-19 Coulombs

Charge of a neutron = 0 Coulombs

And also we all know that there is an attraction and/or repulsion between charges. Such that like charges repel and unlike charges attract. This scenario goes the same with magnetic fields. Like poles repel while unlike poles attract. Such repulsion and attraction serves as the force that moves the charges.

These concepts are essential to understand Coulomb’s Law. According to Charles Coulomb, there is a force that is being exerted between two charges and it is described by this equation;

[tex]F = k\frac{q1*q2}{r^2}[/tex]

Such force is imposed by the existing electric field around those two charges. The electric field is the force exerted for every charge present. To simplify this idea take a look at this formula;

[tex]E = \frac{F}{q2}[/tex]

Now if we superimpose Coulomb’s Law to the existing formula for the Electric field we could get;

[tex]E = \frac{F}{q2}\\\\E =  \frac{k\frac{q1*q2}{r^2}}{q2}\\\\E =  k\frac{q1}{r^2}[/tex]

Thus the electric field affecting a certain charge is  

[tex]E =  k\frac{q1}{r^2}[/tex]

Hence, even there is a very small (almost negligible) force acting on a charge there is also a very small (close to zero) amount of electric field present.  

All things are made up of matter and all matter are made up of atoms. Furthermore, these atoms are composed of these charged particles. Hence, if there is a charge there is an electric force and if there is an electric force, there is an electric field.


To know more about electric charge, electric field and electric force click on these links

brainly.ph/question/761613

brainly.ph/question/357339  

brainly.ph/question/761941  

Hope this helps!



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