参考资料:《大学物理》
如果不一定是在中轴线上呢
追答那就不能抵销,肯定有磁场!
追问你的意思是,在中间只有中轴线的位置上磁场为0咯?=-=
追答是的。
追问'An infinitely long, hollow, cylindrical shell carries a total current I. The current is uniformly distibuted throughout the shell. The inner radius of the shell is a and the outer radius is b. Determine the magnitude of the magnetic field. Magnetic field in and around a hollow cylinder, 0 inside the shell'
-------(classical physics :electromagnetic induction)经典物理电学
求解释。