Let the magnetic field on the earth be modelled by that of a point magnetic dipole at the center of the earth. The angle of dip at a point on the geographical equator:
| (a) | is always zero |
| (b) | can be zero at specific points |
| (c) | can be positive or negative |
| (d) | is bounded |
1. (a, b, c)
2. (a, c, d)
3. (b, c, d)
4. (c, d)
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