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Which of the following is NOT the reason behind selecting marble for making 'formers' for inductance coils?1. It is comparatively cheap.2. It is a non-magnetic material.3. It can be easily machined. 4. It has a very small co-efficient of thermal expansion. |
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Answer» Correct Answer - Option 4 : It has a very small co-efficient of thermal expansion. Criteria for selecting marble for making 'formers' for inductance coils:
'It has a very small co-efficient of thermal expansion' is NOT the reason behind selecting marble for making 'formers' for inductance coils. |
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