39. If there are 48 cells in a battery each of resistance 0.3 ohm and emf 1.8 V, how can they best managed so as to
send a current through external resistance of 3.6 ohm? Find the current also.
40. An ammeter and voltmeter are connected in series to a battery with an emf of 6 V.When a certain resistance is
connected in parallel with the voltmeter the reading of the latter decreases 2 times whereas reading of the
ammeter increases the same number of times. Find the voltmeter reading after the connection of the resistance
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