It's a good book
a summary is most of the time good and a critique can be good or bad depending on the paper.
You can remagnetize a magnet by rubbing a good magnet along the bad one. Do this a few times. Be sure to rub the magnet in only one direction.
not a summary.
no, not really, any summary will give an inaccurate and misleading picture. A good example of this is the summary given on answers.com.
Neither or both.
brain drain conclution
No
You are probably talking about an electro magnet. For detailed explanations and some good drawings see the link on electromagnets here:
Do not introduce new information in a summary.
a good boy is one that you do not get into trouble
its good but expensive