知识问答
最佳答案:Make the torque of motor rotation propotional to the magnetic field.The magnetic
最佳答案:When the solar wind reaches the Earth's vicinity,and the Earth's dipole magnetic
最佳答案:磁体通上直流电,此体内的电磁铁因为通过电流而形成磁场,当触头位于磁场里时,触头闭合,当断开加在磁体上的直流电,去掉外界磁场时,触头接点断开.另外,磁体在通电的情
最佳答案:In order to search for fire rubik's cube,megatron to the earth,and in the arctic
最佳答案:MRF is the magnetic particles dispersed in base fluid in the form of suspension,
最佳答案:电磁感应与动圈式话筒Electromagnetic induction and moving coil type microphone1831年,英国的物理学家