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Which of the following is NOT the reason behind selecting marble for making 'formers' for inductance coils?

Which of the following is NOT the reason behind selecting marble for making 'formers' for inductance coils? Correct Answer It has a very small co-efficient of thermal expansion.

Criteria for selecting marble for making 'formers' for inductance coils:

  • It is a non-magnetic material.
  • It is comparatively cheap.
  • It can be easily machined. 
  • Increased mechanical resistance
  • Higher resistance for high temperatures
  • Better electrical isolation

 

'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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