- What exactly is an electric field?
- Where is the electric field the strongest?
- Can electric field exist without charge?
- Who discovered electric field?
- What are electric fields used for?
- What is electric field made of?
- How does an electric field work?
- Does current produce electric field?
- Can electric field be negative?
- Is electric field always positive?
- What is the formula for electric field?
- How do you know if an electric field is positive or negative?
- Can electric field exist in vacuum?
What exactly is an electric field?
An electric field is a vector field that shows the direction that a positively charged particle will move when placed in the field.
More precisely, if a particle has an electric charge and is in an electric field , the electric force the charge will feel is..
Where is the electric field the strongest?
The relative magnitude of the electric field is proportional to the density of the field lines. Where the field lines are close together the field is strongest; where the field lines are far apart the field is weakest. If the lines are uniformly-spaced and parallel, the field is uniform.
Can electric field exist without charge?
There can not be a charge at a place where there is no field because there are no protons or electrons present and without electrons and protons present there is no electric field. … Q1,Yes, there can be an electric field at a point with no charge. But there will be no force from it untill a point with a charge is there.
Who discovered electric field?
In 1820, Oersted discovered by accident that electric current creates a magnetic field. Prior to that, scientists thought that electricity and magnetism were unrelated. Oersted also used a compass to find the direction of the magnetic field around a wire carrying current.
What are electric fields used for?
The electric field lines flow from positive to negative charges. Such sources are well suited for surface applications such as wound healing, corneal repair or even brain and spinal stimulation with closely-separated, inserted electrodes.
What is electric field made of?
In a moving reference frame, a magnetic field appears instead as a combination of a magnetic field and an electric field, so electric and magnetic fields are made of the same “stuff” (photons). Some electromagnetic interactions involve “real” photons with definite frequencies, energies, and momenta.
How does an electric field work?
Electric field is a vector quantity whose direction is defined as the direction that a positive test charge would be pushed when placed in the field. Thus, the electric field direction about a positive source charge is always directed away from the positive source.
Does current produce electric field?
So, if you have a circuit and you send AC current through (AC = Alternating current) so that the electrons move back and forth, they will create a changing electric field. This produces a magnetic field (because that’s what the universe does). Similarly a changing magnetic field creates an electric field.
Can electric field be negative?
Electric field is not negative. It is a vector and thus has negative and positive directions. An electron being negatively charged experiences a force against the direction of the field. For a positive charge, the force is along the field.
Is electric field always positive?
Electric Field can never be negative . As electric field is Force experienced by charge divided by magnitude of charge . … Hence Electric Field also becomes positive . So , electric field is always positive .
What is the formula for electric field?
the magnitude of the electric field (E) produced by a point charge with a charge of magnitude Q, at a point a distance r away from the point charge, is given by the equation E = kQ/r2, where k is a constant with a value of 8.99 x 109 N m2/C2.
How do you know if an electric field is positive or negative?
Key Points Given a point charge, or a particle of infinitesimal size, that contains a certain charge, electric field lines emanate from equally in all radial directions. If the point charge is positive, field lines point away from it; if the charge is negative, field lines point toward it.
Can electric field exist in vacuum?
No, an electric charge and current cannot exist in a vacuum. All charge-carriers are either massive particles or ‘holes’ in a crystal of massive particles (atoms).