Hall and Corbino Effects. 



321 



producing a corresponding change in the field, is immediately 

 apparent in the behaviour of the galvanometer. With the 

 magnet there is a relatively high field produced per ampere, 

 so that any inconstancy in the magnetizing current is very 

 troublesome in producing fluctuations of the galvanometer. 





















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On the other hand, for the solenoid, the field per ampere is 

 comparatively low and, hence, small variations in the current 

 have little influence on the galvanometer. In fact, while 

 using the solenoid, no such difficulty, on account of small 

 changes in the current, was encountered. 



As will readily be seen from fig. 8, in which the balancing 



