Physics - Current Electricity Question with Solution | TestHub

The series combination of two batteries, both of the same emf$10\mathrm{V},\mathrm{}$but different internal resistance of$20\mathrm{\Omega }$and$5\mathrm{\Omega },\mathrm{}$is connected to the parallel combination of two resistors$30\mathrm{\Omega }$and$\text{x\hspace{0.17em}}\mathrm{\Omega }.$The voltage difference across the battery of internal resistance$20\mathrm{\Omega }$is zero, the value of$\text{x}$(in$\mathrm{\Omega })$is____