(Electromagnets need electricity to work, the poles of electromagnets can be reversed, the strength of electromagnets can be increased) List 2 ways to increase the strength of electromagnets.
(the strength of electromagnets; can be increased; ) Context(the strength of electromagnets can be increased,List([87, 134))):(Electromagnets; need; electricity; to work) Context(Electromagnets need the strength of electromagnets can be increased,List([1, 134))):(Electromagnets; need electricity to work; ) Context(the strength of electromagnets can be increased,List([87, 134))):(the poles of electromagnets; can be reversed; )
the strength of electromagnets can be increased,List([87, 134)) Electromagnets need the strength of electromagnets can be increased,List([1, 134)) the strength of electromagnets can be increased,List([87, 134))
the strength of electromagnets Electromagnets Electromagnets the poles of electromagnets
can be increased need need electricity to work can be reversed
electricity to work