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The series combination of two batteries ...

The series combination of two batteries both of the same emf 10 V, but different internal resistance of `20 Omega` and `5Omega` is connected to the parallel combination of two resistors `30Omega` and `R Omega` . The voltage difference across the battery of internal resistance `20 Omega` is zero, the value of R(in `Omega`) is __________.

Text Solution

Verified by Experts

(40) `Delta V = 20 - il 0 = 0`
I = 2A
`therefore` Effective resistancce of circuit must be `20Omega`
`(10R)/(10 + R) = 8`
R = 40
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