Also presented in experiment form are characteristics of magnets demonstrated by the patterns formed by the iron filings, the movements of compass needles, the changes in force direction of iron sand samples when North and South poles are alternated.
(magnets; demonstrated; by the patterns) (the patterns; formed; by the iron filings) (North and South poles; are alternated; )
magnets the patterns North and South poles
demonstrated formed are alternated
by the patterns
by the iron filings