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Potentiometer

A cell in the...

Question

A cell in the secondary circuit. Gives balancing length of 2.4m in potentiometer of length 10m. If the length of potentiometer is increased by 2m without changing the cells in primary or secondary, the balancing length becomes

A

2m

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B

2.14m

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C

3.4m

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D

2.88m

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Solution

The correct option is D 2.88m
$\frac{l}{l^{'}} = c o n s t a n t \frac{l_{2}}{l_{1}} = \frac{L_{2}}{L_{1}}; \frac{l_{2}}{2.4} = \frac{12}{10} l_{2} = 2.88 m$

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