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68.A potentiometer wire of length 100 cm has a resistance of 10 ohm.It is connected in a series with a resistance and accumulator of EMF 2V and negligible internal 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 resistsnce? Click here to view details: |
| Answer» 68.A potentiometer wire of length 100 cm has a resistance of 10 ohm.It is connected in a series with a resistance and accumulator of EMF 2V and negligible internal 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 resistsnce? Click here to view details: | |