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In a potentiometer arrangement. E₁ is the cell establishing current in primary circuit. E₂ is the cell to be measured. AB is the potentiometer wire and G is a galvanometer. Which of the following are the essential condition for balance to be obtained
a) The emf of E₁ must be greater than the emf of E₂
b) Either the positive terminals of both E₁ and E₂ or the negative terminals of both E₁ and E₂ must be joined to one end of potentiometer wire.
c) The positive terminals of E₁ and E₂ must be joined to one end of potentiometer wire.
d) The resistance of G must be less than the resistance of AB.

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b & c are only true

All are true

a, b & c are only true

a & b are only true

answer is A.

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Detailed Solution

For a potentiometer, primary circuit emf E₁ should be greater than the secondary circuit emf E₂ or else the null point will exceed the length of the potentiometer wire.

Either the positive terminals of both E₁ and E₂ or the negative terminals of both E₁ and E₂ must be joined to one end of potentiometer wire.

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