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In a potentiometer of ten meter length an unknown emf voltage source is balanced at...

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In a potentiometer of ten meter length an unknown emf voltage source is balanced at 60cm length of the potentiometer wire while a 3volt battery is balanced at 45cm length then the emf of the voltage source is O 3V O 2 25V O 4V O 4 5V Marks 4 1

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