Exercise: Materials And Components

Questions for: Materials And Components

The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as
A:
Matthiessen's rule
B:
Debye rule
C:
Curie rule
D:
Onne's rule
Answer: A
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If m is the mass of electron cloud, the equation of motion of electron cloud in the presence of an alternating electric field is of the form
A:
B:
C:
D:
Answer: A
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Fleming's left hand rule is used to find
A:
direction of force on a current carrying conductor
B:
direction of flux in solenoid
C:
direction of magnetic field due to a current carrying conductor
D:
direction of induced emf
Answer: A
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Assertion (A): Resistivity of a perfect single crystal of a metal goes to zero as T approaches zero.

Reason (R): Scattering of electrons is due to deviations from perfect periodicity of lattice.

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 t is relaxation time and tc is average time between collisions, then in an isotropic metal
A:
t = tc
B:
t < tc
C:
tc < t
D:
T = 0.01 te
Answer: A
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