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Statement of a problem № 3776

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A potentiometer wire of length 100 cm has a resistance of 10 S. It is connected in series with a resistance and cell of emf 2 V and of negligible inter- nal resistance. A source of emf 10 mV is balanced against a length of 40 cm of the potentiometer wire. What is the value of the external resistance?

Solution:
A potentiometer wire of length 100 cm has a resistance of 10 S. It is connected

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