# B Compass below earth surface

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1. Jul 9, 2016

### hackhard

since magnetic field lines form closed loops , field inside earth must be due geographic south
will compass below earth's surface point to geographic south?

2. Jul 9, 2016

### Orodruin

Staff Emeritus
The first figure on the Wikipedia page on the Earth's magnetic field should answer your question. The magnetic field inside the Earth is much more complicated than a dipole field.