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Abattery of emf E and negligible internal resistance is connected in series with two resistor of resistances 200ohmand 400ohm. When a voltmeter is connected in parallel with the 200ohm resistor, the reading is 60/7V. But when it is connected across the 400ohm resistor, the reading given is360/7V. find the emf of the battery and the resistance of the voltmeter.​