Does the field source charge field strength have an effect on the point charge field strength

Friend. The relationship between the field strength and the amount of charge is close to the charge.

The source charge of the field is stronger the more the field.

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<> properties: 1. The strength of the electric field at the midpoint of the same charge connection of the same amount.

0, the vertical line.

The outward electric field increases first and then decreases with the midpoint as the boundary, and the positive charge cavity is drafted.

The electric potential decreases and the negative charge potential increases.

2. The electric field strength at the midpoint of the isometric heterogeneous charge connection line is the smallest, and the electric field intensity decreases from the midpoint to the midpoint on the vertical line, and the electric potential of the vertical line is 0.

Distribution characteristics: 1. They are all spatial stereoscopic graphs about the symmetrical distribution of the two charge lines and their perpendicular lines.

2. Electric field lines.

Perpendicular to the equipotential surface, the electric field lines point from the high potential to the lower potential surface. By finding two points in the diagram, we can compare their potentials and determine the electric field force when moving a charge between these two points.

of the work. (Figure 1).

3. The closer to the charge, the denser the electric field lines, the stronger the field strength, using this point we can compare the magnitude of the field strength of two points.

4. For the same amount of heterogeneous charge, the field strength on the line decreases first and then increases, the midpoint is the smallest but not zero, and the electric potential is from high to low. On the perpendicular line of their connection, the electric potential is equal, and all are zero (take the electric potential at infinity as zero, the same below); The field strength decreases from the midpoint to infinity to infinity, until it reaches infinity. It can be seen that where the electric potentials are equal, the field strengths are not necessarily equal.

Fig. 2) 5. Two point charges with equal amounts of positive charge.

The combined field strength at the midpoint of the line is equal to zero; But electric potential is not equal to zero. This point is an example of a field strength of zero and a non-zero electric potential. The electric field lines on the middle perpendicular line of the connected line point to infinity, indicating that the electric potential is decreasing until it reaches infinity. The field strength increases first and then decreases from zero, and it is also zero at infinity.

It follows that the electric potential is zero, and the field strength is also zero.

In a uniform electric field: e=u d;

The field strength of a uniform electric field e=uab d {uab:ab voltage between two points (v), d:ab distance between two points in the direction of field strength (m)

If we know the force of a charge, the electric field strength can be expressed as: e=f q;

The electric field formed by the point charge: e=kq r 2, k is a constant hand, q is the amount of charge of this charge, r is the distance to this charge, it can be seen that with the increase of r, the field strength formed by the point charge gradually decreases (the field strength formed by the point charge is inversely proportional to r 2).

At a certain point, the direction of the field strength of Laqing is to place a positive charge at that point.

Between the positive charge and the positive charge is the repulsive force. The missing silver is directed outward from the charge in the direction of the field strength of the positive charge.

Between the negative charge and the positive charge is the gravitational force. So the direction of the field strength of the punctual charge is directed towards the charge from the outside.

The internal electric field strength of the infinitely long uniformly charged cylindrical surface is zero, and the external electric field strength strength is calculated as shown in the figure below.

The flux of the electric field strength to any closed surface depends only on the algebraic sum of the charges in the closed surface, and is independent of the distribution of the charges in the surface, nor does it depend on the charges outside the closed surface.

Characteristics of field strength distribution:

In any electric field, the field strength of each point p has a certain direction. Based on this, we can draw a series of curves in the electric field, so that the tangent direction of each point on the curve is consistent with the direction of the field strength of that point, and these lines are called electric field lines. In space where there is no charge, the electric field lines are not intersecting and not interrupted.

I think it's all related.

The field source charge provides the electric field, the charge has an electric potential in the electric field, and the electric potential multiplied by the electric amount equals the electric potential energy, so the electric potential energy is related to the field source charge.

The work done by the electrostatic force w=qed, it can be seen that the work done by the electrostatic force is related to the strength of the electric field, while the potential energy of the electrostatic force to do positive work decreases and the potential energy of the negative work increases, so the electric potential energy is related to the strength of the electric field.

(1) According to Gauss's theorem: (its charge surface density is s, and the charge surface density is denoted by , the same below) the sphere concentric with the sphere is used as the Gaussian surface, and the radius is set to 2r.

By symmetry, the field strength is along the radius of the Gaussian surface, and the magnitude of the field strength at each point on the Gaussian surface is equal everywhere.

By Gauss's theorem: e*4 (2r) 2=4 r 2 0e= 4 0

2) It can also be done with Coulomb's law.

The surface charge is equivalent to the center of the sphere, that is, there is a point charge with a charge of 4 r 2 at the center of the sphere, and the field strength at the distance of 2r can be found.

At 0 the field strength is 0, you can find their field strength at 0 separately, but according to the principle of superposition of field strengths, which is the parallelogram rule, their combined field strength at 0 is 0

From 0 point onwards, the field strength increases and decreases, so you plot their field strengths separately and compare them at distances, and you can see that you follow the principle of parallelogram composition.

To the left must be increased, because the left is far from the strong near field, the right far field is small, and the further the left is superimposed, the greater the combined field strength is to the left.

The same goes for right.

The pip value is "0".

2.No change. Field strength db=u0*i*(dl)*sin@ 4 r 2 The values are the same and in opposite directions, and the cancellation is 0.

3.Enlarge. The magnetic flux density becomes greater in one direction and decreases in the other direction.

DB is proportional to the current i in the wire, proportional to the length of DL, inversely proportional to the square of the distance R from the current element to point P, and proportional to the sine of the angle between R and DL

The formula for calculating the strength of the electric field around the point charge:

e=kq r (only for point charges).

where e is the electric field strength, k is the electrostatic force constant k=, q is the amount of electricity of the source charge, and r is the distance between the source charge and the tentative charge.

Each charge forms an electric field around it. The electric field strength of the high school is e=f q, f is the electric field force of the target charge, and q is the charged charge of the target charge The electric field strength distribution in the uniform electric field u=e*d refers to the distribution of different field sources, first differentiated, and then integrated to obtain the electric field strength, and is related to the position of the target charge.

The integral that the electric potential u is equal to. The electric field distribution and electric potential distribution is to find the electric potential in space and the electric field as a function of the spatial coordinates This is the first to establish a coordinate system, and secondly, the electric field is a vector, with magnitude and direction, here a physical quantity called "scalar potential" is introduced, which is the high potential In the electromagnetic field, the time-varying electromagnetic wave will also form an electric field, and the closed magnetic inductance line will also produce an electric field, For general regular objects, it can be regarded as the field strength of any point in the field formed by the charged body in space, and the algebraic formula of electric potential.

e=f q, which is the definition of electric field strength, is applicable to all electric field strength calculations. e represents the field strength at a certain point in the electric field, f represents the electric field force on the (tentative) charge placed at this point, and q refers to the amount of charge on the (tentative) charge. In this formula, e is independent of f and q, and there is no relationship between e and f that is proportional to q and inversely proportional to q.

e=kq r 2, this formula is the determinant of the point charge field strength, and is only applicable to the calculation of the point charge field strength. k is the constant of electrostatic force, q is the charge of the field source charge, and r is the distance from the field source charge. The field strength generated by a point charge at a point is directly proportional to the field source charge and inversely proportional to the square of the distance away from the field source charge.

e=u d, this formula is only applicable to the calculation of the uniform electric field strength. u is the potential difference between two points in a uniform electric field, and d is the distance between these two points along the direction of the field strength. This formula can also be used for qualitative judgment of certain quantities in a non-uniform electric field.

What is the electric field strength of a point charge.