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in Current Electricity by (26.1k points)
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1. Potentiometer is better than voltmeter for measuring emf because

  • It is cheap
  • Easy to handle
  • Its measurement uses null method

2. Give the basic principle of potentiometer,

3.

 

If K2 is open balancing length is 600 cm, if K2 is closed 350 cm is balancing length. Calculate the internal resistance.

1 Answer

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Best answer

1. Its measurement uses null method.

2. Principle:

Potential difference between two points of a current carrying conductor (having uniform thickness) is directly proportional to the length of the wire between two points.

3. I = 600 cm, I = 350 cm

\(r=R\Big(\frac{I-I_1}{I_1}\Big)\) r = 3 \(\Big(\frac{600-350}{350}\Big)\)

\(\frac{3\times250}{350}\) = 2.1 Ω

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