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Consider the following statements associated with moving iron instruments:
1. These can be used in d.c. as well a.c. circuits
2. The scale is non-uniform
3. The moving iron is placed in a field of a permanent magnet.
Which of these statements are correct?
  • a)
    1, 2 and 3
  • b)
    1 and 2
  • c)
    2 and 3
  • d)
    1 and 3
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following statements associated with moving iron instrume...
(b)
Moving iron is not placed in a field of a permanent magnet. Moving iron instrument employs an electromagnet and the iron vane moves in such a way so as to increase the flux of the electromagnet.
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Most Upvoted Answer
Consider the following statements associated with moving iron instrume...
Explanation:

Moving iron instruments are a type of electrical measuring instrument that uses a movable iron piece to measure current or voltage. Let's analyze each statement to determine which ones are correct.

Statement 1: These can be used in d.c. as well a.c. circuits
This statement is correct. Moving iron instruments can be used to measure both direct current (d.c.) and alternating current (a.c.) circuits. The moving iron is attracted to the magnetic field produced by the current flowing through the instrument, regardless of whether it is a direct or alternating current.

Statement 2: The scale is non-uniform
This statement is also correct. The scale of a moving iron instrument is non-uniform, meaning that the divisions on the scale are not evenly spaced. This is because the deflection of the moving iron is nonlinear and depends on the magnitude of the current or voltage being measured.

Statement 3: The moving iron is placed in a field of a permanent magnet
This statement is incorrect. The moving iron in a moving iron instrument is not placed in a field of a permanent magnet. Instead, it is placed in a magnetic field produced by a coil. When a current flows through the coil, it generates a magnetic field that interacts with the moving iron. The direction and magnitude of the current determine the deflection of the moving iron.

Therefore, the correct statements are:

1. These can be used in d.c. as well a.c. circuits
2. The scale is non-uniform

Hence, the correct answer is option 'B' - 1 and 2.
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