178 MAGNETISM 



this case how many of the lines issuing from the NSP of one magnet 

 enter the SSP of the other. 



Fig. 124 shows the field due to two bar magnets arranged in one 



FIG. 122. 



line with unlike poles towards each other, and it may be noted that 

 the mutual induction pulls the two neighbouring poles towards 

 each other. 



Fig. 125 is the field due to two bar magnets arranged in one 

 line with like poles towards each other, and here we notice that 



FIG. 123. 



the lines of force from one NSP do not enter another NSP, but as 

 it were the two sets repel each other and travel out sideways, each 

 set bending round and entering the other end of its own magnet. 

 We notice, too, that there is a point midway between the adjacent 



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FIG. L i i 



