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In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs ?

  1. 62 cm
  2. 60 cm
  3. 21.6 cm
  4. 64 cm

Answer (Detailed Solution Below)

Option 2 : 60 cm
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Detailed Solution

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CONCEPT:

As we know in a potentiometer EMF has two cells in which  and  be the null points and and  be the EMFs,  therefore we can write it as,

CALCULATION:

Given:

Using  we get; 

 ⇒  

 ⇒ 

 ⇒ 

Hence, option B) is the correct answer.

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More Potentiometer Questions

Q1.When the EMF of two cells is compared in a potentiometer experiment, the ratio of balancing length is obtained as 2 ∶ 5. If one of the cells has an EMF of 1.2 V, the other cell's EMF is ______.
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Q7.Potentiometer measures the potential difference more accurately than a voltmeter, because : 
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Q9.A potentiometer wire is supplied a constant voltage of 3 V. A cell of emf 1.08 V is balanced by the voltage drop across 216 cm of the wire. The total length of the potentiometer wire is - 

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