question on electric lines and conductor

i have read that if we place an unit positive electric charge in an electric field the path in which it moves is the electric lines of force of that electric field . is it true ?

and again that the lines of force doesn't make a closed curve . is that also true ? if yes then if we can make a certain arrengement of positive or negetive charge in a manner that if we place an unit positive charge in that place it will go round and round . then the lines of force of that arrengement will be a closed curve . isin't it ?

and at last i can't understand why a conductor does not have an electric field in it ?

thanks in advance