Exercise: Materials And Components

Questions for: 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
A:
normal to both current and magnetic field
B:
in the same direction as current
C:
in a direction anti parallel to magnetic field
D:
none of the above
Answer: A
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Schrodinger wave equation is partial differential equation.
A:
True
B:
False
C:
D:
Answer: A
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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.
A:
1 and 2 only
B:
2 and 3 only
C:
1 and 3 only
D:
1, 2 and 3
Answer: A

∈r has no units and equal to 1 for vacuum. For other substances it has different value.

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Assertion (A): If an atom of polarizability a is placed in homogeneous field E, the energy stored is 0.5 aE2.

Reason (R): Capacitance of an isolated conducting sphere R in vacuum is 4 p∈0 R farads.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: A
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When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.
A:
True
B:
False
C:
D:
Answer: A
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