QJEEM20Ph4447: JEE Main 2020 Physics - Class 12 JEEM20Ph4447 Solution: The series combination of two batteries, both of the same emf…

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