"Field Potential" - physical meaning potential differences. On a closed trajectory work electrostatic field is equal to 0. Energy characteristics of the electrostatic field. The tension inside the conductor = 0, which means that the potential difference inside = 0. The potential value is considered relative to the selected zero level.

"Electrification of bodies" - Development of cognitive activity of students through game forms of lessons. Electrification. “Electrification in nature and in life” Prepared by a physics teacher: Sultanova U.R. “Find the beginning of everything and you will understand much. Development of skills to highlight electrical phenomena in nature and technology. Eletrization. Increased productivity, 50% paint savings.

"Electric field and its intensity" - Demonstration electric field charged electric sultans. Basic properties of the electric field. Electric field lines start at positive charge x and end in negative. What are the types of electric charges? ? Question: Which charge is positive? Field strength point charge.

"Electric field strength" - The unit of voltage in the SI system: [ U ] \u003d 1 B 1 Volt is equal to electrical voltage in the section of the circuit where, with the flow of a charge equal to 1 C, work is performed equal to 1 J: 1 V \u003d 1 J / 1 C. Relationship between electric field strength and potential As is known, in a potential field, the force can be obtained from potential energy from the ratio.

"Potential in physics" - Question number 4. The figure shows a section of a solitary conductive hollow sphere. Question number 6. Question number 5. Physics test "Electric field". 3 2 1. What shows the field potential at a given point. Question number 1. charge on the capacitor plates. Question number 3.

"The charge of the electric field" - An electric field is a type of matter through which the interaction of electric charges occurs. In a uniform electrostatic field, a positive charge moves from point 1 to point 2 along different trajectories. Potential of a point charge. Coulomb's law.

In total there are 9 presentations in the topic

Electric field is a material medium that transmits the interaction of electric charges in accordance with the Coulomb law. The electric field acts only on electric charges and can be investigated using a test charge - a small positive charge, so that it distorts the field under study as little as possible. The force acting on a test charge is proportional to the magnitude of this test charge.

The coefficient of proportionality serves as a force characteristic of the field at a given point and is called electric field strength. Tension is a vector quantity, the tension vector is directed in the same direction as the force vector. The tension is measured by the force acting on a unit test charge placed in given point field, it can be found by Coulomb's law:

Here q- the charge that creates the field, r is the distance from a given point of the field to the charge; if the charge is distributed on the surface of the sphere, then r is the distance from a given point of the field to the center of the ball, and there is no field inside the ball and the intensity is zero. If the field is created by several charges, then the tension at any of its points is equal to the geometric sum of the tension created at this point by each charge separately.

Tension lines, uniform field.

It is possible to depict the electric field using strength vectors, but it is not always convenient. Faraday proposed to represent the electric field using lines of force or lines of tension.

These are such lines tangential to each point of which tension vectors are located. Tension lines are considered to be directed where the tension vectors point. Graphing the field should be remembered:

1. lines of tension do not intersect anywhere;

2. lines begin on positive charges or at infinity, and end on negative charges or at infinity;

There is no interruption anywhere between charges.

In calculations, it is conditionally considered that the number of lines passes through a unit area perpendicular to the lines equal tension, where the surface is located. An electric field whose intensity vector at all points is the same in magnitude and direction is called homogeneous. Tension lines homogeneous field parallel and spaced at equal distances from each other. The field between two oppositely charged plates is homogeneous if the dimensions of the plates are larger compared to the distance between them.

OBJECTIVES FOR UNIT 6

1. Two equal positive charges are 10 cm apart and repel each other with a force of 1000 N. Determine the value of each charge.

Given:

r\u003d 10 cm \u003d 10 × 10 -2 m

F\u003d 1000 n \u003d 10 3 n

________________

q 1 \u003d q 2 \u003d q - ?

Solution:

If the medium is not specified, then it should be assumed that the charges are in air or in a vacuum: e= 1. Let us write down the formula of Coulomb's law, taking into account that q 1 \u003d q 2 \u003d q; where

Substitute the values:

Answer: 3.3×10 -5 C

Actions on dimensions:

2. What atom's nucleus has electric charge equal to 1.312 × 10 -17 C.

Given:

q\u003d 1.312 × 10 -17 K

e\u003d 1.660 × 10 -19 C

Solution:

Let's find how much elementary charges contains this kernel

The desired element takes place 82 in the periodic table, which means it is lead.

3. A force of 0.03 N acts on a charge of 4 × 10 -8 C at some point in the electric field of another charge. Determine the field strength of the second charge at this point.

Given:

q 1 \u003d 4 × 10 -8 C

F= 0.03 N

Solution:

The force acting on a charge placed at a given point in the field is proportional to the magnitude of this charge. The coefficient of proportionality is the force characteristic of the field at a given point, i.e. tension.

Answer: 7.5 × 10 5 N/C

4. Determine the electric field strength of a point charge of 2.7 × 10 -6 C at a distance of 10 cm. The charge is in water.

Given:

q\u003d 2.7 × 10 -6 C

r=10 cm =0.1 m

Solution:

Note: e 0 - expressed as a fraction: