question_answer

The series combination of two batteries, both of the same emf 10 V, but different internal resistance of \[20\text{ }\Omega \] and\[\text{5 }\Omega \], is connected to the parallel combination of two resistors \[\text{30 }\Omega \] and \[\text{R }\Omega \]. The voltage difference across the battery of internal resistance \[20\text{ }\Omega \] is zero, the value of R\[\left( \text{in }\Omega  \right)\] is _______. [JEE MAIN Held on 08-01-2020 Evening]

Answer:

30.00