Сформулируйте вопросы на английском языке и дайте ответы на них. Сформулируйте закон Кулона.
Give a definition of Coulomb’s law.
Coulomb’s experiments showed that the electric force between two stationary charged particles:
1. is inversely proportional to the square of the separation r between the particles and directed along the line joining them;
2. is proportional to the product of the charges q1 and q2 on the two particles;
3. is attractive if the charges are of opposite sign and repulsive if the charges have the same sign.
Force acting between two charged particles is directly proportional to product of charges of these particles and inversely proportional to squared distance between these particles.
Where k-coefficient of proportionality, which is equal k=9*109 (N*m2)/K2.
Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое напряженность электрического поля?
What is the electric field strength?
Electric field is said to exist in the region of space around a charged object. the electric field E at a point in space is defined as the electric force Fe acting on a positive test charge q0 placed at that point divided by the magnitude of the test charge:
Сформулируйте вопросы на английском языке и дайте ответы на них. Сформулируйте правила геометрического описания линий электрического поля.
Formulate rules for the geometric description of the electric field lines.
Rules for drawing electric field lines
• The lines must begin on a positive charge and terminate on a negative charge.
• The number of lines drawn leaving a positive charge or approaching a negative charge is proportional to the magnitude of the charge.
• No two field lines can cross. When a particle of charge q and mass m is placed in an electric field E, the electric force exerted on the charge is qE. If this is the only force exerted on the particle,
it must be the net force and so must cause the particle to accelerate. In this case, Newton’s second law applied to the particle gives
The acceleration of the particle is therefore
If E is uniform (that is, constant in magnitude and direction), then the acceleration is constant. If the particle has a positive charge, then its acceleration is in the direction of the electric field. If the particle has a negative charge, then its acceleration is in the direction opposite the electric field.
Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое распределение заряда по объему, поверхности и длине?
What distribution of charge on volume, to the surface and length?
If the charged body is so great, that he can not be examined as a point charge, then in this case it is necessary to know distribution of charges into a body, the spatial location of charges it is accepted to describe with a help: to the b.d. of charge(r), superficial closeness of charge(s) and linear closeness of charge(l). These sizes are determined by formulas:
b.d.
of charge of r
superficial
closeness of charge of s
