The figure shows a potentiometer arrangement. D is the driving cell and C is the cell whose emf is to be determined. AB is the uniform potentiometer wire and G is galvanometer. J is sliding contact which can touch any point on AB. Which of the following are essential conditions for obtaining balance ?

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either the positive terminals of both C and D or the negative terminals of both C and D be joined to A

the emf of D must be greater than the emf of C

the positive terminals of D and C must be joined

the resistance of G must be less than resistance of AB.

answer is A, B.

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