Potentiometer

Chapter-3|Current Electricity| NCERT 12th Physics:

Potentiometer:

A long wire (of few metres) of uniform cross section area.

 

Applications:

1. To measure EMF of a cell:

We will find null point on wire where G shows no deflection.

 

2. To compare of EMF of two cells:


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3. To measure internal resistance of a cell:
 
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