Thanks, Sitran, for the webpage.
There are a lot of features in most languages that are irregular. There’s nothing for it: you just have to learn every single use. There isn’t really a rule about the -ic/-ical endings. There will always be people who say electrical shock, and there is George Dubya Bush (we thank God that the US hasn’t taken the idea of Queen’s English and created President’s English).
A rule of thumb is:
-ic endings indicate that the item so described is intrinsically connected with the idea behind it - electric eels, electric showers, electric blue, electric supply.
-ical endings indicate that the item so described is concerned with the idea behind it - electrical wiring, electrical skills, electrical appliances.
Egoistic I would use to describe a person’s own belief.
Egoistical I would use to describe any thoughts, words or actions that come from being an egoist.
Fanatic I would use to describe an extremely enthusiastic person.
Fanatical would be the preferred adjective.
Classic I would use to evaluate something: to give it classic status.
Classical I would use as a more factual description of something artful and stylish.
Magic I would use to describe something that is inherently magical: a magic carpet.
Magical I would use to describe something that involves magic, or a sense of magic: a magical holiday.
Politic is quite clearly different from poilitical. It is closer to polite, and is a synonym for diplomatic when describing a thoughtful carefulness: "His interruption was politic, to say the least".
Political is a description of the systems of social authority: "The ‘Axis of Evil’ speech was more political than politic".
I hope that helps.
- Garzo.