A doubt in understanding of fields
时间：03-30
整理：3721RD
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Hello,
My query is regarding interpretation of electric and magnetic fields. Assume a DC current flowing through a long conductor. Then we know that there is a magnetic field around it which can be solved by B-S law. Now if the observer begins to move relative to the conductor, then the relative velocity between electrons and observer lessens and hence rate of motion of electrons should reduce which means that the magnitude of magnetic field should be reduced. If the observer moves at the drift velocity of electrons(which is very high but for hypothetical case assume so without fear of 'relativity' induced issues), then he observes it to be a set of static charges and hence there is only electric field in this situation.
So can it be concluded that the magnitude and nature of field is dependent on frame of reference? Any discussions involving both quantitative and qualitative analyses are invited.
Thank you.
P.S: The observer is assumed to move in the direction of electron motion parallel to the conductor. This is no strong restriction for analysis. The problem may be analysed for any motion where the relative velocity is prone to change.
krishna prasad
Engineer,
Electronics Corporation of India Limited
My query is regarding interpretation of electric and magnetic fields. Assume a DC current flowing through a long conductor. Then we know that there is a magnetic field around it which can be solved by B-S law. Now if the observer begins to move relative to the conductor, then the relative velocity between electrons and observer lessens and hence rate of motion of electrons should reduce which means that the magnitude of magnetic field should be reduced. If the observer moves at the drift velocity of electrons(which is very high but for hypothetical case assume so without fear of 'relativity' induced issues), then he observes it to be a set of static charges and hence there is only electric field in this situation.
So can it be concluded that the magnitude and nature of field is dependent on frame of reference? Any discussions involving both quantitative and qualitative analyses are invited.
Thank you.
P.S: The observer is assumed to move in the direction of electron motion parallel to the conductor. This is no strong restriction for analysis. The problem may be analysed for any motion where the relative velocity is prone to change.
krishna prasad
Engineer,
Electronics Corporation of India Limited
Hello,
I am not into relativity now, but try a search on: length contraction charge density. This will definitely give you links to info that shows you the relation between the magnetic field, electric field and the reference frame you are in.