The disc of an instrument using eddy current damping should be of________________?
Correct answer: C. conducting and non-magnetic material
- A. conducting and magnetic material
- B. non-conducting and magnetic material
- C. conducting and non-magnetic material
- D. none of the above
Explanation
The disc must conduct electricity so that eddy currents can be induced, but it should be non-magnetic so that damping does not depend on magnetic attraction. Hence a conducting, non-magnetic disc is used.
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