The current through a 10-ohm lamp energized by two series-opposing ideal batteries is measured to have a magnitude of 1 ampere. Determine the individual EMFs of the two batteries if the magnitude of the current through the same lamp becomes 2 amperes when the batteries become series-aiding.     15 and 25 volts;     5 and 15 volts     20 and 30 volts;     10 and 20 volts;

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