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The magnetic moment of the assumed dipole at the earth’s centre is 7.0 ×1022Am2. The magnetic field B at the geomagnetic poles of the earth is P×1014R3 (The radius of earth is ‘R’), then the value of ‘P ’ is__

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answer is 0140.00.

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Detailed Solution

The geomagnetic pole is at the end on position of the earth (axial position) B=μ04π.2Md3given : d=R ⇒B=107×2×7×1022R3=14×1015R3Hence, P×1014R3=14×1015R3 P=140.00

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