Tila Tequila

which way does the direction of voltage go in electromagnetic(GCSE)?

I don’t understand which way the direction of the voltage depends on. I mean if you put the magnet into a coil of wire and the magnet is put in at south which way does it go on the voltmeter i.e postivie or negative and also why?
Please answer the question basically don’t copy stuff from wiki
Thanks for your help.