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Tushar Watts Grade: 12
        

A potentiometer wire of length 100 cm has  aresistance 10 ohm. It is connected in series with a tesistance and an accumulator of emf  20V and of negligible 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. 

8 years ago

Answers : (1)

Ramesh V
70 Points
										

Let ext. resistance be R ohma


let current be I


so 20 = I(10+R)


also I*4 = .01 V


so, I=2.5*10-3


on substitution, we get R = 7990 ohms


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Naga Ramesh

IIT Kgp - 2005 batch

8 years ago
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