According to the characters of the work of magnetic force, the concept of potential energy can be brought in the nonconservative system-magnetic field.
根据磁力做功的特点，在非保守场———磁场中也可以引入势能的概念。
2
The results show that natural convection can be formed on condition that the body force acting on the fluid is a non-conservative one.
结果表明：只要流体所受体积力为非保守力，即可产生自然对流。
3
Natural convection is induced by non-conservative body force, which can be gravity, centrifugal or magnetic force;