1) A potentiometer wire of length 100 cm has a resistance of 10 ohm. It is connected in series with a resistance and an accumulator of emf 2V and of negligible reistance.A source of emf 10 mV is balanced against a length of 40cm of the potentiometer wire. Whatis the value of the external resistance?
2) The figure shows an arrrangement to measure the emf and int resistance of a battery. The voltmeter has high resistance and the ammeter has low resistance. Suppose the voltmeter reads 1.52 V when the switch S is open. When the switch is closed the voltmeter reading drops to 1.45 V and the ammeter reads 1.0 A. Find the emf and int resistance of the battery
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