346 HOW ELECTRICITY IS USED IN THE HOME 



ing it near one. In early times artificial magnets were 

 always made in this way, but since we have come to generate 

 electricity and send it in a current through wires, we find 

 that we can make better magnets by its use. Of this 

 process we shall learn later. 



Experiment. To determine laws of magnetic poles. 



Materials: A bar magnet. A suspended magnet (may use needle of 



compass). 



Method and Results: Bring the north pole of the bar magnet near the south 

 pole of the compass needle. Result? Bring the south pole near the 



north pole. Result? 

 Make similar tests 

 with the south pole 

 of the bar magnet. 

 Results? 



Conclusion: Formulate 

 a law concerning the 

 attraction and the re- 

 pulsion of magnetic 

 poles. 



The properties of 

 magnets. As we 

 have seen magnets 

 attract unmagnet- 

 ized iron and steel. 

 They will also at- 

 tract two other met- 

 als, nickel and co- 

 balt. The attractive 



What law of magnetism is illustrated here ? f Qrce fe greatest near 



the ends of the magnets. These points of greatest at- 

 tractions are called the poles of the magnet. Halfway 

 between the poles is the magnetic equator, a region of 

 practically no magnetic attraction. If a magnet is sus- 

 pended so that it swings freely in a horizontal plane, it 



