MHT CET Physics question
Not in JEE Advanced syllabus
Obtain the earth's magnetisation assuming that the earth's field can be approximated by a giant bar magnet of magnetic moment . The earth's radius is 6400 km.
Answer: (B)
Solution
\dfrac{8.0×10^{22}}{\frac43π(6.4×10^{6})^3}$≈73\
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