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The magnetic moment of the assumed dipole at the earth’s center is 8×1022 Am2. The magnetic field B at the geomagnetic poles of the earth is P×1015R3.(where R is Radius of earth). Then the value of ‘P’ is___

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answer is 16.

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Detailed Solution

The geometric pole is at the end on position of the earth B=μ04π.2Md3 d=R ; M=8×1022 Am2 ; B=P×1015R3 ∴B=10−7×2×8×1022R3 ⇒P×1015R3=16×1015R3 ⇒P=16.

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