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What is value of R

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Asked by Prashant DIGHE 19th July 2019, 5:09 PM
Answered by Expert
Answer:
 
Current in the circuit, I = 2E / ( r1 + r2 + R )  ...................(1)
 
if potential differece across first cell is zero, then we have  E - ( I×r1 ) = 0  ............(2)
 
by substituting I from eqn.(1), eqn.(2) is written as ,  E - [ (2E×r1) / ( r1 + r2 + R ) ] = 0  ................(3)
 
from eqn.(3), we get R = r1 - r2
Answered by Expert 20th July 2019, 10:28 AM
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