Can anyone give me the formula for calculating the electric field and the magnetic field all .

1.Magnetic induction intensity is a physical quantity used to express the strength and direction of the magnetic field, which is a vector quantity, unit t), 1t 1n a m

2.Ampere f bil; (Note: l b).

3.Lorentz force f qvb (note v b); Mass spectrometer See Volume II p155 {f: Lorentz force (n), q: charged particle charge (c), v: charged particle velocity (m s)}

4.With gravity negligible (gravity is not taken into account), the motion of charged particles into the magnetic field (grasp two kinds):

1) The charged particles enter the magnetic field in the direction of the parallel magnetic field: they are not affected by the Lorentz force and move in a uniform linear motion v v0

2) Charged particles enter the magnetic field in the direction of the perpendicular magnetic field: do a uniform circular motion, the law is as follows: a) f to f mv2 r m 2r mr(2 t)2 qvb; r＝mv/qb；t＝2πm/qb；(b) the period of motion is independent of the radius and linear velocity of the circular motion, and the Lorentz force does no work on the charged particle (in any case); (c) Key to solving the problem: draw the trajectory, find the center of the circle, fix the radius, and center angle (double chord tangent angle).

Note: 1) The direction of the ampere force and the Lorentz force can be determined by the left-handed rule, but the Lorentz force should pay attention to the positive and negative of the charged particles;

Electrostatic force f kq1q2 r2 (k, direction on their line).

The electric field force f eq (e: field strength n c, q: electric charge c, the electric field force of the positive charge is in the same direction as the field strength).

Ampere force f bilsin (is the angle between b and l, when l b: f bil, b l: f 0).

Lorentz force f qvbsin (is the angle between b and v, when v b: f qvb, v b: f 0).

The w=qu mentioned upstairs should be the work done by the electrostatic force, which is equal to the amount of change in the electric potential energy, and the electric potential energy is equal to the work done by the electrostatic force to move the charge at the point to the zero potential energy point.

The formula for calculating the strength of the magnetic field is: h = n i le.

where: h is the strength of the magnetic field, and the unit is a m; n is the number of turns of the excitation coil; i is the excitation current (measured value), unit bit a; LE is the effective magnetic circuit length of the test sample in m.

The force exerted on the unit positive magnetic charge in the magnetic field is known as the magnetic field strength h. Later, Ampère proposed the molecular current hypothesis, arguing that there is no magnetic charge and that the essence of magnetic phenomena is molecular current. Since then, the strength of the magnetic field has been mostly expressed by the magnetic induction intensity b.

However, in the magnetization problem of magnetic media, the magnetic field strength h still plays an important role as an exported auxiliary quantity.

A stationary electron has a stationary electron mass and a unit negative charge, so it exerts a gravitational force and a unit negative electric field force. When an external force accelerates and moves a stationary electron, the external force not only provides kinetic energy for the overall motion of the electron, but also provides magnetic energy for the magnetic field generated by the moving charge.

It can be seen that the magnetic field is a magnetic energy substance injected into the moving electrons by an external force through energy conversion. The magnetic field produced by an electric current or the magnetic field produced by a negatively charged point charge are both macroscopic manifestations of a magnetic field produced by a large number of moving electrons.

In the same way, the magnetic field generated by a moving positively charged point charge is the macroscopic manifestation of the magnetic energy obtained by the excess protons from an external force. However, its magnetic energy matter is attached to the charged quarks in it.

The formula for the changing electric field to produce a magnetic field:Magnetic induction.

It is a physical quantity used to express the strength and direction of the magnetic field, which is a vector quantity, unit t), 1t=1n am.

Ampere f bil; (Note: l b).

Lorentz force. f=qvb(Note v b); Mass spectrometer {f: Lorentz force (n), q: charged particle charge (c), v: charged particle velocity (m s)}.

Definitions

Electromagnetic field is a general term for the intrinsically related and interdependent unity of electric and magnetic fields. An electric field that varies with time produces a magnetic field, and a magnetic field that changes with time produces an electric field, and the two are causal to each other to form an electromagnetic field. Electromagnetic fields can be caused by charged particles moving at varying speeds, or by electric currents that vary in intensity, and regardless of the cause, electromagnetic fields always propagate at the speed of light to form electromagnetic waves.

The electromagnetic field is the medium of electromagnetic action, has energy and momentum, and is a form of existence of matter.

The magnetic field formulas are: F Bil (where B is the magnetic induction intensity at the position of the energized wire, I is the current intensity in the energized wire, and L is the length of the energized wire), F Qvb (where B is the magnetic induction intensity at the position of the moving charge, Q is the amount of charge of the moving charge, and V is the velocity of the moving charge), F=KQ1Q2 R. The magnetic field formula is:

F bil (where b is the magnetic induction intensity at the position of the energized wire, i is the current intensity in the energized wire, l is the length of the energized wire), f qvb (where b is the magnetic induction intensity at the position of the moving charge, q is the amount of charge of the moving charge, v is the velocity of the moving charge), f = kq1q2 r.

The formula for voltage in a magnetic field is,The current is directly proportional to the magnetic field.

When the resistance is constant, the relationship between voltage and current is proportional, b = ki r, k = minus nine times of 2*10, r is the radius from the space point to the straight wire, b is proportional to h (the product of magnetic dielectric coefficient and vacuum permeability) h = 900 gauss.

Extrapolated backwards, N2S L is related to solenoids.

Magnetic field is a kind of invisible, intangible, and objectively existing special substance, can be put into the small magnetic needle has a magnetic effect, there is a magnetic field around the magnet, the interaction between the magnet traces is based on the magnetic field as the medium, the magnet does not need to contact at the physical level to act, the change of the moving charge or electric field can produce a magnetic field, the same way, the changing magnetic field can also produce an electric field, electromagnetic field and geomagnetic field are two common magnetic attitude hail field.

Basic characteristics of magnetic field:

Similar to the electric field, the magnetic field is a vector field that is continuously distributed in a certain spatial area, and the basic physical quantity describing the magnetic field is the magnetic induction intensity vector.

b, you can also rent magnetic inductance wires.

Figuratively deputed, however, as a vector field, the nature of the magnetic field is quite different from the electric field, and the magnetic field produced by the moving charge or the changing electric field, or the total magnetic field of the sum of the two, is a passive and spin vector field, magnetic field lines.

is a closed cluster of curves, uninterrupted, not intersecting.

In other words, there is no source of emitting magnetic field lines in the magnetic field, and there is no tail of converging magnetic field lines, and the closure of the magnetic field lines indicates that the loop integral along the magnetic field lines is not zero, that is, the magnetic field is a spin field rather than a potential field conservative field, and there is no scalar function similar to the electric potential, in quantum mechanics.

Scientists believe that pure magnetic and electric fields are the effects of virtual photons.

The formula for calculating the magnetic field force is h=n i le. The magnetic field force is the force exerted by the magnetic field on the moving charge and electric current in it. Magnetic field forces include Loren magnetism and ampere force. The force exerted by the magnetic field on the moving charge is called the Lorentz force, and the force exerted by the magnetic field on the electric current is called the ampere force.

Magnetic field, a physical concept, refers to the field that transmits the magnetic force between physical objects. The magnetic field is a special substance that cannot be seen or touched. A magnetic field is not made up of atoms or molecules, but a magnetic field exists objectively.

The magnetic field has the radiative properties of wave particles. There is a magnetic field around the magnet, and the interaction between the magnets is based on the magnetic field, so the two magnets can interact at the physical level without the need for trembling. An electric current, a moving charge, a magnet, or a special form of matter that exists in the space around the electric field.

Magnetic field formula: h=n i le. where: h is the strength of the magnetic field.

The unit is a m; n is the number of turns of the excitation coil; i is the excitation current (measured value), unit bit a; LE is the effective magnetic circuit length of the test sample in m.

Several forces in electromagnetism:1. Electric field force.

The force exerted on the charge in the electric field, f=qe,q the amount of charge of the object studied, e: the field strength at the place where the charge q is located.

It has nothing to do with the state of motion of the charge, and the force of the electric field is applied to it as long as it is in the electric field.

2. Coulomb force.

The force between the point charges in two vacuums, f=kq1q2 r.

k: electrostatic force constant. Q1Q2 The amount of charge at two point charges. r: The distance between two points of charge.

3. Ampere.

The force exerted by the energized wire in the magnetic field, the high stage value considers the special case of three perpendiculars.

f=: The intensity of the magnetic induction at the location of the energized wire.

i: The intensity of the current in the energized wire.

l: The length of the energized wire.

The formula that must be mastered in electromagnetism: Coulomb's law.

E=f q Point charge electric field strength: E=kq r Uniform electric field: E=u d Potential energy: E = q potential difference.

u = electrostatic force work: w=qu capacitance definition: c=q u capacitance:

c= s 4 kd Motion of charged particles in a uniform electric field Acceleration uniform electric field: 1 2*mv =qu v =2qu m Deflection uniform electric field: motion time:

t=x v vertical acceleration.

a=qu md vertical displacement: y=1 2*at =1 2*(qu md)*(x v) deflection angle: =v v=qux md(v) microcurrent:

i=NeSv non-electrostatic force work of a power supply: w= q Ohm's law.

i=u r series circuit current: i =i =i = voltage: u =u +u +u + parallel circuit voltage:

u=u=u= …Current: i = i + i + i + ....Resistors in series: r = r + r + r + ....Resistors in parallel:

1/r =1/r+1/r+1/r+ …Joule's law: q=i rt p=i r p=u r electrical power: w=uit electrical work:

p=ui Resistance Law: R= l s Ohm's Law for Full Circuits: =i(r+r) U Outside + U Inside Ampere Force:

f=ilbsin magnetic flux.

bs electromagnetic induction induced electromotive force: e=nδ t wire cutting magnetic inductance line: δs=lvδt e=blv*sin induced electromotive force: e=lδi δt