\(U_m = \int_{r_a(C)}^{r_b} \mathbf{H} \cdot dr\), where \(\mathbf{H}\) is magnetic field strength and \(r\) is the position vector along a given curve \(C\) from point \(a\) to point \(b\).
n4:plainTextDescription
"Magnetic Tension} is a scalar quantity equal to the line integral of the magnetic field strength \mathbf{H" along a specified path linking two points a and b.