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प्रश्न
The earth's magnetic field lines resemble that of a dipole at the centre of the earth. If the magnetic moment of this dipole is close to 8 × 1022 Am2, the value of earth's magnetic field near the equator is close to ______. (radius of the earth = 6.4 × 106 m)
पर्याय
0.6 Gauss
1.2 Gauss
1.8 Gauss
0.32 Gauss
MCQ
रिकाम्या जागा भरा
उत्तर
The earth's magnetic field lines resemble that of a dipole at the centre of the earth. If the magnetic moment of this dipole is close to 8 × 1022 Am2, the value of earth's magnetic field near the equator is close to 0.6 Gauss. (radius of the earth = 6.4 × 106 m)
Explanation:
Given M = 8 × 1022 Am2
d = Re = 6.4 × 106 m
Earth's magnetic field, B = `mu_0/(4pi).(2"M")/"d"^3`
= `(4pixx10^-7)/(4pi)xx(2xx8xx10^22)/((6.4xx10^6)^3)` ≅ 0.6 Gauss
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