Answer:
The principle of a potentiometer is that the potential dropped across a segment of a wire of uniform cross-section carrying a constant current is directly proportional to its length. The potentiometer is a simple device used to measure the electrical potentials (or compare the e.m.f of a cell).
Explanation:
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B) Greenpeace
Why? They work to create awareness (:
Pressure increases with increasing depth. h2=2hh
