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Q 2 Two batteries one of the emf 3V internal resistance 1 ohm and the...

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Q 2 Two batteries one of the emf 3V internal resistance 1 ohm and the other of emf 15 V internal resistance 2 ohm are connected in series with a resistance R as shown If the potential difference between a and b is zero the resistance of R in ohm is A 5 B 7 C 3 D 1 O A O B O c C C 3V 10 15V 202 R

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