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Engineering Materials in EE

Engineering Materials in EE
Maximum number of electrons in a sub-shell with l = 3 and n = 4 is

 8.
 20.
 14.
 10.

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Engineering Materials in EE
Permittivity of free space is equal to

 8.854 × 10 - 11 F / m.
 8.854 × 10 - 12 F / m.
 8.854 × 10 - 13 F / m.
 8.854 × 10 - 10 F / m.

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Engineering Materials in EE
In order to minimise loss due to hysteresis, the magnetic material should have

  large B-H loop area.
  low hysteresis coefficient.
  high resistivity.
  high retentivity.

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Engineering Materials in EE
Materials which lack permanent magnetic dipoles are called

None of these
 ferro-magnectic.
 semi-magnetic.
 dia-magnetic.

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Engineering Materials in EE
The core of a transformer for microwave frequency should be made of

  silicon.
 iron.
  silicon carbide.
  ferrites.

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Engineering Materials in EE
All ions of an element have the same

 number of protons.
 both option A. and C.
 number of electrons.
 atomic number.

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