Materials and Components
For making a capacitor it is better to have a dielectric having

Low permittivity
High permittivity
Permittivity which is neither high nor low
Permittivity same as that of air

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Materials and Components
At room temperature the number of conducting electrons in an intrinsic semiconductor

Is a very small fraction of the number of valence electrons
Is about half the number of valence electrons
Is small as compared to the number of valence electrons
Is almost equal to the number of valence electrons

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Materials and Components
Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

In a direction anti parallel to magnetic field
Normal to both current and magnetic field
None of these
In the same direction as current

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