Question

Which of the following will be the best selection for the core of an LVDT?

• A. Air
• B. Nickel-iron
• C. Rubber
• D. Platinum

Hint:

Nickel-iron alloys are often used in LVDT cores due to their excellent magnetic properties, ensuring high sensitivity and accuracy in measurements.

Answer 1

The Correct Option is B

The core material in an LVDT must be ferromagnetic to ensure efficient coupling between the coils. 
Among the options: 
- Nickel-iron is an ideal material for the core of an LVDT because of its magnetic properties that ensure a strong and stable inductive coupling.
- Air does not have the required magnetic properties to support the inductive coupling, making it unsuitable.
- Rubber is a non-magnetic material and does not contribute to the inductive coupling in an LVDT.
- Platinum is not typically used as the core material in LVDTs due to its cost and lack of suitable magnetic properties for this application.
Therefore, the correct answer is Nickel-iron.