Train of thought

Train of thought

Electric field: electric field strength e = f / Q, (applicable to any electric field). F is the electric field force. Q is the amount of charge. E = u / D (applicable to uniform electric field). U is the potential difference. D is the distance between two electric levers
Magnetic field: magnetic field intensity B = f / (IL) f is electric field force. I is current. L is length
Lorentz force; fro = QVB; q is the amount of charge; V is the velocity; B is the intensity of the magnetic field

What is the magnetic field of steady current?

The magnetic field in vacuum is mainly divided into two parts: one is the magnetic field excited by the current; the other is the effect of the magnetic field on the current, Then the total magnetic induction at a point in space is equal to the vector sum of the magnetic induction excited by each field source charge at that point
A moving charge produces a magnetic field

There is a changing magnetic field in vacuum. The changing magnetic field excites () A. electrostatic field B. steady magnetic field C. induced electric field D. induced current
There is a variable magnetic field in vacuum. The variable magnetic field excites ()
A. Electrostatic field
B. Steady magnetic field
C. Induced electric field
D. Induced current

C. Induced electric field