Physics · Measuring Instruments
Read the given Assertion (A) and Reason (R) carefully and select the correct option. Assertion (A): Weakening of control springs in Permanent Magnet Moving Coil (PMMC) instruments is due to aging and temperature variations. Reason (R): Permanent magnets used in PMMC instruments tend to lose some of their magnetic strength over time.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Both A and R are true, and R is the correct explanation of A.
- 2A is true, but R is false.
- 3Both A and R are true, but R is not the correct explanation of A.✓
- 4A is false, but R is true.
Correct answer
Both A and R are true, but R is not the correct explanation of A.
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