Определение line of force в Английский Язык Английский Язык словарь
an imaginary line in a field of force, whose tangent at any point gives the direction of the field at that point and whose number through unit area perpendicular to the field represents its intensity
A theoretical line in a field of force, such that a tangent at any point gives the direction of the field at that point
an imaginary line in a field of force; direction of the line at any point is the direction of the force at that point