Define electrostatic ?
Answers
Answer:
Electrostatics, the study of electromagnetic phenomena that occur when there are no moving charges—i.e., after a static equilibrium has been established. ... Finally, energy can be stored in a capacitor; the energy required to charge such a device is stored in it as electrostatic energy of the electric field.
Answer:
electrostatics deals with the phenomena and properties of stationary or slow-moving electric charges. Electrostatic phenomena arise from the forces that electric charges exert on each other and are described by Coulomb’s law. Even though electrostatically induced forces seem to be rather weak.
Coulomb’s Law of Electrostatics
Electrostatic force of interaction acting between two stationary charges is given by
F = 1 / 4π εo q1q2 / r2
where q1, q2 are magnitude of point charges, r is the distance between them and εo is permittivity of free space.
Here, 1 / 4πεo = (10-7 N – s2 / C2)C2
Substituting value of c = 2.99792458 X 108 m/s,
We get 1 / 4πεo = 8.99 x 109N-m2/C2
In examples and problems we will often use the approximate value,
1 / 4πεo = 9 * 109N-m2/C2
The value of εo is 8.85 * 10-12 C2 / N-mC2.
If there is another medium between the point charges except air or vacuum, then εo is replaced by εoK or εoεr or ε.
where K or εr is called dielectric constant or relative permittivity of the medium.
K = εr = ε / εo
where, ε = permittivity of the medium.
For air or vacuum, K = 1
For water, K = 81
For metals, K = ∞