Сформулируйте вопросы на английском языке и дайте ответы на них. Сформулируйте правила геометрического описания линий электрического поля.
What can you say about Terms drawing 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
Сформулируйте вопросы на английском языке и дайте ответы на них. Чему равно ускорение частицы заряда q и массы m в электрическом поле е?
What is the acceleration of particle equal to charge of q and the masses of m in the electric field of Е?
In
accordance with the law of Coulomb electrostatic field created by a
point charge Q at a distance r from it, is equal in absolute value:
This field is called Coulomb. In the Coulomb field vector direction depends on the sign of the charge Q: if Q> 0, then the vector is directed along the radius of the charge, if Q <0, the vector is directed to the charge.
In the present problem for the calculation of the formula can be applied field strength in the capacitors:
Here
U - voltage between the capacitor plates, d - the distance between
the plates.
The force with which the field acts on the charge calculated by the formula F = Eq. However, according to Newton's second law, we obtain an expression for the field with known charge, mass and acceleration: E = ma / q.
Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое электрическое равновесие? Сформулируйте свойства проводников в состоянии равновесия.
What is the electrical equilibrium? Specify properties of conductors in equilibrium?
When there is no net motion of charge within a conductor, the conductor
is in electrostatic equilibrium
A conductor in electrostatic equilibrium has the following properties:
1. The electric field is zero everywhere inside the conductor; no electric field can exist inside a conductor. However, this statement is true only if the conductor is in static equilibrium.
2. Any net charge on the conductor resides entirely on its surface.
3. The electric field just outside the conductor is perpendicular to its surface and
has a magnitude where _ is the surface charge density at that point.
4. On an irregularly shaped conductor, the surface charge density is greatest
where the radius of curvature of the surface is the smallest.