Under what situations does the null point or balancing point shift in a potentiometer?

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Solution

$B a l a n c i n g p o i n t s h i f t s i n a p o t e n t i o m e t e r b e c a u s e o f t h e f o l l o w i n g r e a s o n s : 1) t h e r e s i s \tan c e o f t h e w h e a t s t o n e b r i d g e a r m s c h a n g e s . 2) T h e e m f o f t h e c e l l s o r c e l l c h a n g e s . 3) T h e i n t e r n a l r e s i s \tan c e o f t h e c e l l s o r b a t t e r y c h a n g e s . 4) J o c k e y s l i d e s o n t h e p o t e n t i o m e t e r w i r e w h i c h h e a t s u p t h e w i r e a n d r e s i s \tan c e c h a n g e s .$

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