In a metallic conductor, the current negative charge is transferred by free electrons, and by what i

In a metal conductor, the free electrons move directionally to form an electric current, and the nucleus with a positive charge does not move, i.e., the positive charge does not move only the electrons are moving, and the movement of the electrons can form an electric current, which does not require a positive charge to move and does not transmit any positive charge.

The movement of free electrons from the A-terminal to the B-terminus can be equivalent to the positive charge moving from the B-terminus to the A-terminus, but the effect is the same, not the positive charge is really moving.

In the circuit (junior), outside the power supply, the direction of free electron movement is from the negative pole to the positive pole, which is right.

If A is positively charged, B is not charged, and AB is connected by wires, then the free electrons go from B to A, why? The positive and negative charges attract each other, and A attracts the electrons in B there.

After the free electron goes from B to A, B is missing electrons, B is positively charged, and the positive charge is just equivalent to from A to B, A does not transfer any particles, A gets electrons, and finally Ab is positively charged, the positive charge of A is less than the original, and the decrease of A is equal to the increase of B.

Electrons have a negative charge and nuclei have a positive charge.

In physics, the directional movement of electrons produces an electric current.

Outside the power supply, the direction of electron movement is from negative to positive, and the direction of current is from positive to negative, and the direction of current is opposite to the direction of qualitative movement of electrons.

A has a positive charge, A lacks electrons, AB joins, the free electrons of B move towards A, and finally AB has an equal amount of positive charge.

If a positively charged object m is approached by an uncharged metal conductor n, the left end of n induces a negative charge and the right end induces a positive charge, and if the left end of n is grounded, then there is a positive charge on n.

The left end of n is grounded, the potential is zero, the potential contribution of m to n is positive, n induces a negative charge, keeps the n potential zero, and the positive charge flows into the ground. In essence, the negative charge of the earth flows into the metal n, and the general definition of n is the flow of positive charge into the earth.

ABCD is wrong, you check if the question is written incorrectly.

1. In a metal conductor, the freely moving charge is a free electron, so the direction of the free charge in the metal is opposite to the direction of the current;

2. Free electrons, that is, delocalized electrons, are electrons in a molecule that have nothing to do with a specific atom or covalent bond, mainly the free charge in a metal conductor.

Metallic conductors rely on the directional movement of free electrons to form an electric current, which is negatively charged, and the direction of the current is opposite to that of the negative charge.

So the answer is free electrons; On the contrary

Choice B, because of the grounding, the conductor n is equal to the earth potential, m is positively charged and close to n, n and the earth are equipotential bodies, so the positive charge is repelled to the farthest, figuratively speaking, the positive charge is repelled to the other end of the earth.

Definition: The quantity charged by an object or the particles that make up an object, which is the algebraic sum of the elemental charges in an object or system.

There are only two types of electric charges in nature, namely positive and negative. The charge carried by the glass rod rubbed by silk is called a positive charge, and the charge carried by the rubber rod rubbed by the fur is called a negative charge. The most basic properties of electric charge are:

The same charge repells each other, and the different charges attract each other. One of the intrinsic properties of matter. The phenomenon that amber can attract small and light objects after friction is the earliest discovery of the charge of objects.

Then it was discovered that lightning strikes, induction, heating, irradiation, etc., can make objects electrified. Electricity is divided into positive and negative, the same sign rejects, different signs attract, positive and negative combined, neutralizes each other, electricity can be transferred, one increases and the other decreases, and the total amount remains the same.

The basic unit of matter is the atom, the atom is composed of electrons and nuclei, and the nucleus is composed of protons and neutrons, the electrons are negatively charged, and the protons are positively charged, which is the basic unit of positive and negative charges, and the neutrons are not charged. The so-called uncharged object means that the number of electrons is equal to the number of protons, and the charging of the object is the destruction of this balance. In nature, there is no charge that exists separately from matter.

In an isolated system, no matter what changes occur, the total number of electrons and protons remains the same, but the way they are combined or their location changes, so the charge must be conserved.

To illustrate the characteristics of electric charge, some analogies can be made with mass. There are positive and negative charges, so electricity has a difference between repulsion and attraction, and there is only one mass, which always attracts each other, and it is this difference that makes electricity shielded, but gravity cannot shield. a.

Albert Einstein described the relativistic effect of mass as a function of motion; The electric charge of electrons, protons, and all charged bodies does not change due to motion, and the electric charge is a relativistic invariant. Charge is quantum, any charge is an integer multiple of the electron charge e, the exact value of e (recommended in 1986) is: The difference between the proton and the electron charge (absolute value) of the e-library is less than 10-20e, and the absolute value of the two is generally considered to be exactly equal.

Electrons are very stable, with an estimated lifespan of more than 101 billion years, much longer than the age of the universe has been projected so far.

The conductor is because there are a large number of freely moving electrons in it, called carriers, which move regularly under the influence of external voltage, forming an electric current. The conductor itself is not charged, because the amount of electrons and holes inside the conductor is equal, so the overall performance is still uncharged.

No. There are electrons in the conductor that move freely.

Mainly metal.

1.Positive charge.

Approaching the metal rod, the electrons on the metal rod move in the direction of the charge closer to the point, reaching electrostatic equilibrium.

After grounding, the electrons of the earth are subjected to the attraction and flow to the conductor, which becomes negatively charged.

2.Negatively charged.

Moving closer to the metal rod, the electrons on the metal rod move away from the point charge to reach electrostatic equilibrium.

After grounding, the electrons of the metal rod are subjected to a repulsive force and flow towards the earth, and the conductor becomes positively charged.

A positive spot charge will attract electrons to the conductor, but the current will be in the opposite direction. After grounding, electrons flow into the earth and positive electricity remains. In the case of a negative charge, the negative charge in the repulsive conductor moves, and the current flows towards the negative charge.

Grounding, it is still the flow of negative charge like the earth, because the mass of negative charge is smaller than that of positive charge and can move.

The direction of the current is the opposite of the direction in which the positive charge moves or the negative charge moves.

That is, free electrons.

Free electrons are free charges in metallic conductors. Not only the free charge in the conductor, but also the free charge in the semiconductor and the trace free charge in the insulator are all free electrons. The outer electrons (valence electrons) of semiconductor metal atoms become free electrons when they are freed from the nucleus.

The free electron density of copper is 8 5 10 28 m 3. The free electron density of various metals is of the same order of magnitude. Most of the carriers in n-type semiconductors are free electrons.

When two different atoms are close to each other, there are certain conditions in the surroundings, such as the increase in temperature, which accelerates the movement speed of electrons outside the nucleus, so that the electrons are attracted by the nucleus with stronger attraction and detached from the original nucleus, and the other reason is affected by external conditions, such as the increase in temperature, which improves the ability of electron movement. Since the attraction capacity of the nucleus is realized within a certain range, the temperature increases the kinetic energy (movement ability) of the electron, so that its motion ability increases, and in a certain probability the attraction range of the nucleus is exceeded by motion, and the electron is freed from the bondage of the nucleus to form a free electron, the former reason belongs to chemical change, and the latter should belong to physical change, because no new matter is formed, but the process of the formation of the latter free electron is just the intermediate reaction link of a complete chemical reaction It will not disappear after getting rid of it, It may be captured by other atoms to form extranuclear electrons of other atoms.