Materials and Components
Which of the following are true for relative dielectric constant?1. It is dimensionless.2. It is equal to 1 for vacuum.3. It is equal to 1 for all substances.

1 and 3 only
1, 2 and 3
1 and 2 only
2 and 3 only

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Materials and Components
An atom of a rare gas is placed is an electric field E. Then

The nucleus will be shifted in the direction of E by an amount which is proportional to E.
The nucleus will not be shifted.
The nucleus will be shifted in the direction of E by an amount which is independent of E.
The nucleus will be shifted in a direction opposite to that of E.

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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

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

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