Exercise: Materials And Components

Questions for: Materials And Components

Assertion (A): The equation D = ∈0∈rE is applicable only to isotropic materials.

Reason (R): In polycrystalline materials, the directional effects are absent.

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: B
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If v is velocity of electron, ε0 is absolute permittivity, m is mass of electron, e is charge on electron and r is the radius of orbit of electron in hydrogen atom, the stability of orbit requires the following equation to be satisfied
A:
B:
C:
D:
Answer: B

Centrifugal force is equal to and coulomb force is equal to .

For stability they must be equal.

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The relative permeability of a ferromagnetic material is
A:
1
B:
less than 1
C:
about 10
D:
1000 or more
Answer: D
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For a superconductor, the relative permeability is
A:
zero
B:
high
C:
low
D:
either low or high
Answer: A
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Macroscopic quantities of a given material
A:
are absolutely constant
B:
are a function of temperature
C:
are a function of temperature, pressure field
D:
none of the above
Answer: D
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