A storage battery of emf 0.8 V and inter...

A storage battery of emf 0.8 V and internal resistance `0.5 Omega` is being charged by a 120 V supply using a series resistor of `15.5 Omega`. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?

11.5 V

20 V

21.5 V

12.3 V

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