双棒问题是综合性较强的问题,它涉及的知识面很广,有动力学的(相对运动、变加速和变减速运动、牛顿第二定律)、能量的(能量守恒定律)、动量的(动量定理、质点组的动量定理、动量守恒定律)和电磁学的(安培力、闭合电路的欧姆定律、法拉第电磁感应定 Double rod problem is a comprehensive problem, which involves a wide range of knowledge, kinetic (relative movement, variable acceleration and deceleration movement, Newton’s second law), energy (energy conservation law), momentum (Momentum Theorem, Momentum Theorem of Mass Set, Momentum Conservation Law) and Electromagnetism (Ampere Force, Ohm’s Law of Closed Circuit, Faraday’s Electromagnetic Induction