The experiment of measuring magnetic induction by the impact method is quantatively analysed in theory,pointing out that the action tlme of pulse current is the main factor influencing measuring results and giving an equation to correct experiment results.
Because the magnetoresistance effect of Hall element is directly proportional to the square of magnetic induction,changing the distance between magnet and Hall element will arouse the changing of the electric resistance of Hall element,then the electric resistance signal is transformed into voltage signal,the equivalent magnitude of displacement will be obtained by measuring the voltage signal.
(2) Optical property of the Zeeman part is investigated experimentally. When the magnetic induction intensity is bigger than 3mT, the frequency difference of the laser will become stabilization and it is directly proportional to the magnetic induction intensity and inversely proportional to the peak-peak value of the beat frequency.
Through the discussion about electric field intensity, potential displacement, magnetic induction intensity and magnetic field intensity, we find out electric field intensity and potential displacement do not only have relation with free electric charge, but also with polarization charge;
The linear transient eddy current electromagnetic field problem for determining solution is characterized by replacing the interface condition of the tangential component of the electric field intensity by the interface condition of the normal component of the magnetic flux density,and ignoring the displacement current in the constraint equations.