Potentiometer (Comparing EMFs) (E1/E2 = l1/l2 for null method on uniform wire (same)
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E1/E2 = l1/l2 for null method on uniform wire (same current during comparison)
What each symbol means
| Symbol | What it stands for |
|---|---|
| E_i | EMFs compared (V) |
| l_i | Balancing lengths on potentiometer wire (m or cm consistently) |
When to use this
Uniform resistance per unit length; steady current in driver circuit during both readings; null galvanometer.