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Potentiometer

A battery wit...

Question

A battery with negligible internal resistance is connected with 10m long wire. A standard cell gets balanced on 600 cm length of this wire. On increasing the length of potentiometer wire by 2m, the null point will be displaced by,

A

200 cm

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B

120 cm

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C

720 cm

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D

600 cm

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Solution

The correct option is B 120 cm
By using $\frac{L_{1}}{L_{2}} = \frac{l_{1}}{l_{2}} \Rightarrow \frac{10}{12} = \frac{600}{l_{2}} \Rightarrow l_{2} = 720 c m$
Hence displacement = 720 – 600 = 120 cm

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