Charge measurement force

1. Charge quantity: the amount of charge.
generally, the charge quantity of positive charge is expressed by a positive number, while the charge quantity of negative charge is expressed by a negative number.
the charge quantity of any charged body is always equal to an integral multiple of a minimum charge
this minimum charge is called elementary charge, also known as elementary charge
, expressed by E, e = 1.60217733 × 10 ^ - 19C
in the calculation, e = 1.6 can be taken × 10 ^ - 19C
it is equal to the charge of an electron and a proton
and coulomb is the unit of electric quantity
1 Coulomb = 1 ampere · s
coulomb is the unit of electric quantity, the symbol is C. It was named in memory of the French physicist Coulomb. If the conctor carries a steady current of 1 ampere, the amount of electricity passing through the cross-sectional area of the conctor in 1 second is 1 Coulomb
coulomb is not an international standard unit, but an international standard derived unit. The negative charge of an electron e = 1.6021892 × 10 ^ 19 Coulomb (elementary charge), that is to say, 1 coulomb is equivalent to 6.24146 × The total charge of 10 ^ 18 electrons
formula of charge quantity:
q = it (where I is current, unit a
; T is the time in seconds

2. When C touches a first, a band (- 4q) / 2 = (- 2q), C band (- 4q) / 2 = (- 2q)
when C collides with B again, C band [(- 2q) + q] / 2 = (- Q / 2), B band [(- 2q) + q] / 2 = (- Q / 2)
if the distance r of AB can be given, then the electrostatic force between a and B in the following case is
F = k * QA * QB / R ^ 2 = k * (2q) * (Q / 2) / R ^ 2 = k * q ^ 2 / R ^ 2
note: 1. When the calculation power is large, the electric quantity is the absolute value< If F0 = k * (4q) * q / R ^ 2, then f = F0 / 4

3. Firstly, the change of magnetic flux in the coil ring rotation is calculated Φ= B △ s
recalculate the average inced electromotive force E = n △ Φ/ From Ohm's law of closed circuit I = E / R, q = I △ t = n △ Φ/ R

4. It is considered that the electric quantity on the spherical shell is evenly distributed, so the electric quantity of the small circular hole is proportional to the area. Q / (4 μ R2) can be regarded as the electric quantity per unit area, and then multiplied by μ R2 is the electric quantity of the small circular hole

5.

Q=It( Where I is current, unit a, t is time, unit s)

unit is Coulomb (marked as C). The "charged particle" is often called a charge, but the charge itself is not a "particle", but it is often imagined as a particle for convenient description

Therefore, those with more charge are called having more charge, and the amount of charge determines the force field (Coulomb force). In addition, according to the direction of the force of the electric field, the charge is divided into positive charge and negative charge, and the electron is negatively charged

according to Coulomb's law, objects with the same kind of charge will repel each other, and objects with different kinds of charge will attract each other. The force of repulsion or attraction is proportional to the proct of charges

Coulomb's law is the first quantitative law in the history of the development of electricity, which makes the study of electricity from qualitative to quantitative, and is an important milestone in the history of electricity

it points out that the interaction force between two static point charges in vacuum is inversely proportional to the square of the distance and directly proportional to the proct of the electric quantity. The direction of the force is along the line, and the charges with the same sign repel each other, while the charges with different signs attract each other

There is interaction between charges in

extended data

. Static charge generates electrostatic field in the surrounding space, while moving charge generates magnetic field as well as electric field. Therefore, the static or moving charge will be affected by the electric field force, and only the moving charge can be affected by the magnetic field force

Whether an actual charged body can be regarded as a point charge depends not only on the charged body itself, but also on the nature and accuracy of the problem. Point charge is a necessary abstract concept to establish the basic law, and it is also an indispensable means to analyze complex problems

For example, the establishment of Coulomb's law and Lorentz's law, the quantitative study of the electric field of charged body and the interaction between charged bodies, the introction of experimental charge, and so on, all apply the concept of point charge

In particle physics, many particles are charged. Charge is an additive quantum number in particle physics

The law of charge conservation is also applicable to particles. The sum of charges of particles before reaction is equal to the sum of charges of particles after reaction, which is strictly true for strong interaction, weak interaction and electromagnetic interaction

6. 1e=1.60217733 × 10 ^ - 19C, e = 1.6 × 10^-19C.
6.25 × The charge quantity of 10 ^ 18 elementary charges is 1C.
1 Coulomb = 1 ampere · s
1 Coulomb (c) = 1000 millicoulomb (MC) = 1000000 microcolumn (UC)

7.

1. Q = it (where I is current, unit a, t is time, unit s)

2. Q = ne (where n is integer, e is elementary charge, e = 1.6021892) × Q = Cu (where C is capacitance and u is voltage)

8. I = q / T = 15 / 60A = 0.25A
u = I * r = 0.25 * 12V = 3V
electric quantity is equal to current times time

9. Generally, the amount of charge of positive charge is expressed by a positive number, and the amount of charge of negative charge is expressed by a negative number. The amount of charge of any charged body is always equal to the integral multiple of a certain minimum amount of charge, which is called elementary charge, also called elementary charge, expressed by E, 1e = 1.60217733 × 10 ^ - 19C, e = 1.6 in calculation × 10^-19C It is equal to how much an electron is charged and how much a proton is charged. The basic unit of electricity in the international system of units is Coulomb, the dimension is I * t, 1 Coulomb = 1 ampere · second. Coulomb is the unit of electricity, the symbol is C. It was named in memory of the French physicist Coulomb. If the conctor carries a steady current of 1 ampere, the amount of electricity passing through the cross-sectional area of the conctor in 1 second is 1 Coulomb. Coulomb is not an international standard unit, but an international standard derived unit. The negative charge of an electron is Coulomb (elementary charge), that is to say, 1 coulomb is equivalent to 6.24146 × The total charge of 10 ^ 18 electrons. The formula of charge quantity: q = it (where I is the current, unit a; T is the time in seconds