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The series combination of two batteries,...

The series combination of two batteries, both of the same emf 20 V, but different internal resistance of `10Omega and 2 Omega , is connected to the parallel combination of two resistors 10 ohm and `ROmega` . The voltage difference across the battery of internal resistance `10 Omega` is zero, the value of `R (in Omega`) is _________.

Text Solution

Verified by Experts

The correct Answer is:
40
`Delta V = 20 -i10 = 0`
` i=2A`
`therefore` Effective resistance of circuit must be `20 Omega`
`(10R)/(10 + R) = 8`
`R = 40`
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