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The battery in the diagram is to be char...

The battery in the diagram is to be charged by the generator `G`. The generator has a terminal voltage of `120` volts when the charging current is `10` amperes. The battery has an emf of `100` volts and an internal resistance of `1` ohm. In order to charge the battery at `10` amperes charging current, the resistance `R` should be set at

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