Figure 3 is a contour plot of the constant G(a, β). When a = 3, β = 2, G(a, β) = 0.1423 is the maximum value.

Figure 4 shows a single layer solenoid closed spiral wound ring. If the pitch of the spiral wound ring is omitted, the magnetic field strength of the ring of the N turns is:

The external is 0. When r changes, H also changes. If the radius of the ring tends to infinity, and the number of turns n per unit length is constant, then the spiral winding transitions to an infinitely long solenoid whose magnetic field strength tends to be constant, ie:

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B. Magnetic induction The relationship between magnetic induction (referred to as magnetic induction or magnetic induction) or magnetic flux density (referred to as magnetic density) B (unit or wei/m 2 ) and magnetic field strength is:

Where μ———the permeability of the medium.
Expressed in vacuo μ o μ, a value of 4π × 10 -7 (H / m). For practical purposes, μ is equal to μ o in air. Since B and H differ by only one scale factor μ o , both B and H can be referred to as magnetic field strength. Magnetic induction is a measurable quantity

Where q—the particle charge;
υ →———The speed of movement of charged particles.
Equation (14) can be considered as a definition of B→.
C magnetic flux The magnetic flux φ (unit is Wei [bo]) passing through a given surface is determined by the area

Thus, the magnetic flux outside the closed surface is zero.

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