| 释义 |
magnetic constant
magnetic constant n (General Physics) the permeability of free space, which has the value 4π × 10–7 henry per metre. Symbol: M0 Also called: absolute permeability Magnetic Constant
magnetic constant[mag′ned·ik ′kän·stənt] (electromagnetism) The absolute permeability of empty space, equal to 1 electromagnetic unit in the centimeter-gram-second system, and to 4π × 10-7 henry per meter or, numerically, to 1.25664 × 10-6 henry per meter in the International System of units. Symbolized μ0. Magnetic Constant a proportionality constant μ0 which occurs in a number of formulas involving magnetism when they are written in rationalized form (in the International System of Units). Thus, the induction B and intensity H of a magnetic field are related in a vacuum by the formula B = μoH, where μ0 = 4π ×10-7 henry sperm (H/m) ≈ 1.26 ×10-6 H/m. |