Another silly question, we don't use magnetic fields for deflecting radiation because we can build only weak magnets? (just idea, electricity comes from solar

Another silly question, we don't use magnetic fields for deflecting radiation because we can build only weak magnets? (just idea, electricity comes from solar panels/"nuke plants" and is probably only non ending resource in space.) A burst from capacitors for powerful electromagnet, could be future? edit: found answer from comments: http://news.ycombinator.com/item?id=5315143 http://news.ycombinator.com/item?id=5315143