My Learning Cart
?
Categories
Account

A potentiometer is used to compare two emf sources. If the first source gives a

₹0.0
Login to Download
  • 📥 Instant PDF Download
  • ♾ Lifetime Access
  • 🛡 Secure & Original Content

What’s inside this PDF?

Question: A potentiometer is used to compare two emf sources. If the first source gives a balance length of 60cm and the second gives 90cm, what is the ratio of their emfs?

Options:

  1. 2:3
  2. 3:2
  3. 1:1
  4. 4:5

Correct Answer: 3:2

Solution: 

The ratio of emfs is equal to the ratio of the balance lengths, so it is 60cm:90cm = 2:3.

A potentiometer is used to compare two emf sources. If the first source gives a

Practice Questions

Q1
A potentiometer is used to compare two emf sources. If the first source gives a balance length of 60cm and the second gives 90cm, what is the ratio of their emfs?
  1. 2:3
  2. 3:2
  3. 1:1
  4. 4:5

Questions & Step-by-Step Solutions

A potentiometer is used to compare two emf sources. If the first source gives a balance length of 60cm and the second gives 90cm, what is the ratio of their emfs?
  • Step 1: Understand that a potentiometer is used to measure the electromotive force (emf) of two different sources.
  • Step 2: Note the balance lengths given for each emf source. The first source has a balance length of 60 cm, and the second source has a balance length of 90 cm.
  • Step 3: Recognize that the ratio of the emfs is the same as the ratio of the balance lengths.
  • Step 4: Write the ratio of the balance lengths: 60 cm for the first source and 90 cm for the second source.
  • Step 5: Simplify the ratio 60 cm:90 cm by dividing both numbers by their greatest common divisor, which is 30.
  • Step 6: After simplification, the ratio becomes 2:3.
  • Potentiometer Principle – A potentiometer measures the electromotive force (emf) of a source by balancing it against a known reference, where the balance length is directly proportional to the emf.
  • Ratio Comparison – The ratio of the emfs of two sources can be determined by comparing the lengths at which they balance on the potentiometer.
Soulshift Feedback ×

On a scale of 0–10, how likely are you to recommend The Soulshift Academy?

Not likely Very likely
Home Practice Performance eBooks