The series combination of two batteries, both of the same emf \( 10 \mathrm{~V} \), but differen...

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The series combination of two batteries, both of the same emf \( 10 \mathrm{~V} \), 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 [JEE Main=2020 (January)]
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