Coulomb law
Coulomb's law is a formula describing the interaction between charges, and the expression is:
F=kq 1q2/r^2
Where f represents the interaction force between charges, k is Coulomb constant, q 1 and q2 are the charge amounts, and r is the distance between charges.
Electric field intensity formula
The electric field strength is the strength of the electric field at a certain point, and the expression is:
E = F/q
Where e stands for electric field strength, f stands for electric field force and q stands for charge amount.
Electric potential energy formula
The electric potential energy is the energy of the charge in the electric field, and the expression is:
U = qV
Where u stands for potential, q is charge and v is potential.
Latent formula
The potential describes the energy state of the electric field at a certain point, and the expression is:
V = k*q/r
Where V stands for potential, K is Coulomb constant, Q is charge amount, and R is the distance of charge to a certain point.
Flux density formula
Magnetic flux density is the magnetic field density at a certain point, and the expression is:
b =ф/S
Where b represents the magnetic flux density, Ф represents the magnetic flux passing through a certain surface, and s is the area.
lorentz force
Lorentz force describes the acting force of charge in electric and magnetic fields, and the expression is:
F = q(E + v × B)
Where f stands for Lorentz force, q stands for charge, e stands for electric field strength, v stands for charging speed, and b stands for magnetic field strength.
Ampere loop theorem formula
Ampere loop theorem describes the properties of magnetic field in closed loop, and the expression is:
∮B dl =？ 0 I
Where b is the magnetic field strength, l is the loop length and I is the current passing through the loop. 0 is the permeability in vacuum.
Faraday's law of electromagnetic induction formula
Faraday's law of electromagnetic induction describes the relationship between magnetic field and electromotive force in the circuit, and the expression is:
ε=-dφ/dt
Where ε is the induced electromotive force, φ is the magnetic flux and t is the time.
In a word, the electromagnetic formula in college physics is one of the most basic and important formulas in physics. They describe the relationship between important concepts such as electric field, magnetic field, charge, current and potential, and are important tools for physics research and application.