Exercise: Materials And Components

Questions for: Materials And Components

Assertion (A): When an electron is revolving in its orbit and magnetic field is also present, the angular frequency of electron will be affected by the magnetic field.

Reason (R): In the case of electron revolving in its orbit in the presence of magnetic field, the orbital magnetic dipole moment is not affected by the presence of magnetic field.

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: C

Orbital magnetic moment is equal to (-e/2m).

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Dielectric constant of transformer oil is about
A:
1
B:
4
C:
10
D:
20
Answer: B
No answer description is available. Let's discuss.
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Assertion (A): If WF is Fermi energy, v is velocity of electron and m is mass of electron, then .

Reason (R): Conductivity of a metal depends on temperature and impurity concentration.

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
No answer description is available. Let's discuss.
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In metals the thermal conductivity K and electrical conductivity σ are related as (K/σT) = L, L is known as
A:
Lattice constant
B:
Lorentz number
C:
Lanevin function
D:
Larmor number
Answer: B
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The relationship of hysteresis loss to maximum flux density was first determined by
A:
C. Steinmetz
B:
G.R. Kirchoff
C:
Mr. Laplace
D:
Mr. Ampere
Answer: A
No answer description is available. Let's discuss.
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