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  4. A potentiometer has a uniform wire of length 5 m. A battery of emf 10 V and negligible internal resistance is connected between its ends. A secondary cell connected to the circuit gives balancing length at 200 cm. The emf of the secondary cell is

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Q. A potentiometer has a uniform wire of length $5\,m$. A battery of emf $10\,V$ and negligible internal resistance is connected between its ends. A secondary cell connected to the circuit gives balancing length at $200 \,cm$. The emf of the secondary cell is

KCETKCET 2020Current Electricity

Solution:

Emf of cell in the secondary circuit =potential gradient $x$ balancing length
$\Rightarrow (10 / 5) \times 2=4\, V$