The series combination of two batteries, both of the same emf 10V, but different internal resistance of 20 Ω Ω and 5 Ω Ω , is connected to the parallel combination of two resistors 30 Ω Ω and R Ω Ω . The voltage difference across the battery of internal resistance 20 Ω Ω is zero, the value of R (in Ω Ω ) is ___
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(30)
V 1 = ε 1 – i. r 1
0 = 10 – i × 20
i = 0.5A
V 2 = ε 2 – ir 2
= 10 – 0.5 × 5
V 2 = 7.5V
0.5 = 
0.5 = 0.25 + 
= 0.25; x = 
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