What is the situation when the electric field strength is negative, and what does the electric field

The electric field strength is a vector quantity, and the electric field is a vector field, and the electric field can be illustrated by the image map of the power line.

Vectors are represented by magnitude and direction, and the geometric representation of their vectors is represented by a directed line segment with an arrow. The electric field strength is negative when the direction of the electric field strength is opposite to the specified direction or the direction of the arrow in the vector diagram.

But it's not a force

Electric field strength. It is a physical quantity that describes the properties of an electric field.

Not force. For example, if an electric field is generated by a positive charge, then the radial outward field strength is positive, and the direction of the charge field strength is negative. is a vector, positive and negative table direction.

When the electric field strength is vector, his positive and negative represents the direction, he is not a force.

The positive and negative signs of physical quantities have a variety of meanings:

1. For vectors on a straight line, plus or minus signs indicate two directions on the line. The direction of the vector on the plane is not represented by plus or minus signs, and is usually described in Cartesian coordinate system as: +x direction, +y direction, -x direction, -y direction.

2. The positive and negative signs of scalar quantities have a wider meaning, such as the positive and negative signs of electricity represent electrical properties;The plus or minus sign of the temperature indicates whether it is above or below zero;The positive or negative potential energy of gravity depends on the position of the zero potential energy, and if the object is above the zero potential surface, the potential energy is positive, and vice versa is negative......

In the field strength definition formula e=f q, q is the amount of electricity of the tentative charge (usually q represents the tentative charge, q represents the field source charge), and the positive value is uniformly taken regardless of the positive and negative chargesf is the magnitude of the electric field force, which is also taken as a positive value;In the formula, e is the magnitude of the field strength, and there will be no negative value. The direction of the field strength e is specified in such a way that the direction of the field strength e is the same as the direction of the electric field force experienced by positive q.

The subtext is that the direction of e is the opposite direction of the electric field force experienced by negative q.

Electric field strength is a physical quantity used to express the strength and direction of an electric field.

Experiments show that at a certain point in the electric field, the ratio of the electric field force (positive charge) at the test point to the charge carried by it is a quantity that has nothing to do with the charge at the test point. Therefore, the direction of the electric field force at the point of the test point (positive charge) is the direction of the electric field, and the vector with the ratio of the magnitude is defined as the electric field strength of the point, which is often expressed by e.

Strength algorithm. Definition: The ratio of the electrostatic force f to the amount of charge at a point in the electric field is called the electric field strength at that point.

Definition: e=f q, f is the force of the electric field on the tentative charge, q is the amount of charge of the test charge (tentative charge) placed at a point in the electric field.

Direction of electric field strength: Specified as the direction of the electrostatic force experienced by the positive charge placed at the point. It is the same as the positive charge and opposite to the negative charge.

Physical significance: A physical quantity that describes the strength or weakness of an electric field, and a physical quantity that describes the nature of the force of an electric field. The magnitude of the electric field depends on the electric field itself, or on the charge that excites the electric field, and has nothing to do with the charged charge in the electric field.

Applicable conditions: Applicable to all electric fields.

The electric field strength is a vector quantity.

Determinant formula of electric field: e=kq r2 (only for point charges). where e is the electric field strength, k is the electrostatic force constant, q is the amount of electricity of the source charge, and r is the distance between the source charge and the tentative charge.

Electric field force: f=eq.

Electric field strength [1].

It is a fundamental physical quantity that describes the properties of the electric field, and it is a vector quantity. Abbreviated as field strength. It is specified that its direction is the same as the direction of the electric field force experienced by the positive charge at that point.

According to this regulation, the direction of the electric field force experienced by the negative charge at that point is opposite to the direction of the electric field strength. The basic characteristic of an electric field is that it can subject the electric charge in it to an electric field force.

The electric field strength e at an observation point in the electric field is equal to the stationary charge q placed at that point'The force f and the amount of electricity q are exerted'than. Test charge q'The value should be small enough not to change the electric field at which it is located. In this way, the electric field strength is equal to the force experienced per unit of positive charge.

The electric field force on a negative charge is always in the opposite direction to the field strength.

The definition of field strength is derived based on the characteristics of the electric field that acts on the charge. It is suitable for both electrostatic fields excited by charges and vortex electric fields excited by changing magnetic fields. The characteristic of the electric field is that there is an electric field force on the charge, the positive charge is forced in the same direction as the electric field, and the negative charge is forced in the opposite direction to the electric field.

An electric field is a substance that has energy, and the energy of the electric field is greater when the field is strong.

Properties: An electric field is a vector field that is directed in the direction of the force of the positive charge. The nature of the force of the electric field is described in terms of the strength of the electric field. Basic properties of electric fieldAny charged body that is put into an electric field will be subjected to the electric field force.

In the same space, if there are several stationary charges that produce an electric field in space at the same time, then the field strength at a point in space is the vector sum of the field strength generated at that point when the field source charges exist separately.

The direction of the field strength is the same as the direction of the electric field, which is either away from the direction of the positive charge or towards the direction of the negative charge. The electric field force is the direction in which the charge is subjected to the force in the electric field, the positive charge is subjected to the same direction as the electric field line, and the negative charge is subjected to the opposite direction of the electric field line.

The direction of the field strength is far away from the positive charge, and according to the attraction of the opposite sex, the negative charge will move in the direction of the positive charge, that is, the direction of the force is directed towards the positive charge, so the direction of the electric field force experienced by the negative charge is opposite to the direction of the field strength.

Summary. The electric field strength is a vector quantity, there is no positive or negative distinction, only magnitude and direction. When doing the question, you may encounter that the electric field strength is written as a negative value, and this negative sign actually represents the direction, which does not mean that the magnitude of the electric field strength is a negative value, but that the direction of the electric field strength is opposite to the positive direction you specified.

For example, if an electric field of 10 N C to the left is combined with an electric field of 4 N C to the right, it is easy to know that the field strength is 6 N C and the direction is to the left. A negative sign will appear in the specific calculation column. For example, if the right direction is positive, then the combined field strength is -10+4=-610, and a negative sign is added in front of it to represent that the field strength is to the left, which is opposite to the specified positive direction, and it is found to be -6n c, indicating that the combined field strength is small to 6n c, and the direction is opposite to the specified positive direction, that is, the combined field strength is to the left.

The electric field strength is a vector quantity, there is no positive or negative distinction, only magnitude and direction. When doing the problem, you may encounter that the electric field strength is written as a negative value, and this negative sign represents the direction of the ridge, which does not mean that the magnitude of the electric field strength is a negative value, but that the direction of the electric field strength is opposite to the positive field direction you specified. For example, if an electric field of 10 N C to the left is combined with an electric field of 4 N C to the right, it is easy to know that the field strength is 6 N C and the direction is to the left.

A negative sign will appear in the specific calculation column. For example, if the right direction is specified as the positive direction, then the combined field strength is -10+4=-610, and a negative sign is added in front of it to represent that the field strength is to the left, and it is incompatible with the specified positive direction, and it is -6n c, indicating that the combined field strength is 6n c, and the direction is opposite to the specified positive direction, that is, the combined field strength is to the left.

In electromagnetism it is stated as follows:1For the unclosed surface (plane) S, the electric flux generated by the electric field line passing through S can be arbitrarily selected as positive or negative.

2.For closed surfaces (such as spherical surfaces), the electroslag hall grip flux when the electric field line passes through is generally selected to be positive.

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.

The strength of the electric field refers to a magnetic field between a positive and negative charge because of electricity. If there is a magnetic field, it will be strong, and this force will have strength.

Electric field strength is a physical quantity used to express the strength and direction of an electric field.