Magnetism and matter exercise solution | ncert solution class 12th physics part 2
hello student
In this video, we will discuss some important points regarding magnetism and matter chapter like, how the magnetic field create, can the magnetic field exist 4 to 5 years ago in the earth, can magnetic field vary from point to point in space and time etc. I hope this video is helpful for you
The earth’s magnetic field varies from point to point in space. Does it also change with time? If so, on what time scale does it change appreciably?
The earth’s core is known to contain iron. Yet geologists do not regard this as a source of the earth’s magnetism. Why?
#The charged currents in the outer conducting regions of the earth’s core are thought to be responsible for earth’s magnetism. What might be the ‘battery’ (i.e., the source of energy) to sustain these currents?
#The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth’s field in such distant past?
#The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?
#Interstellar space has an extremely weak magnetic field of the order of 10–12 T. Can such a weak field be of any significant consequence? Explain.
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05:40 5.2 (b)
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Ashwin Khodiyar