Diamagnetism

Q. If B_H and B_V are the horizontal and vertical components of earth's magnetic field, then at magnetic poles

यदि पृथ्वी के चुम्बकीय क्षेत्र के क्षैतिज तथा ऊर्ध्वाधर घटक क्रमशः B_H तथा B_V हैं, तब चुम्बकीय ध्रुवों पर

1. B_H = 0, B_V = 0
2. B_H = 0, B_V ≠ 0
3. B_H ≠ 0, B_V ≠ 0
4. B_H ≠ 0, B_V = 0

Q. The variation of magnetic susceptibility $\chi$ with temperature for a diamagnetic substance is best represented by

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4.