Answer one of the following two questions or both please a) The Earth has a magnetic field.
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Question:
Answer one of the following two questions or both please
a) The Earth has a magnetic field. Describe the shape of the Earths magnetic field. How does the magnetic declination varry between the equator and the poles.
Or
b) Use domain theory to explain why a needle becomes magnetized by rubbing it in oune direction with a strong permanent magnet and why heating or dropping a permanent magnet will cause it to loose it's magnetic field.
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