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The relaxation time in conductors...

The relaxation time in conductors

A

Increases with the increase of temperature

B

Decreases with the increase of temperature

C

It does not depend on temperature

D

None of these

Text Solution

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The correct Answer is:
B
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If temperature of a good conductor increases,how does the relaxation time of electrons in the conductor change

A non ohmic conductor?

Knowledge Check

  • A coaxial consists of a thin inner current carrying conductor fixed along the axis of a hollow current carrying conductor. Let B_1 and B_2 be the magnetic fields in the region between the conductors and outside the conductor respectively.

    A
    `B_1 ne0 , B_2 ne=0 ` for conductors carrying equal currents in opposite sie.
    B
    `B_1 ne0 , B_2 ne=0 ` for conductors carrying unequal currents in opposite direction.
    C
    `B_1 ne0 , B_2 ne=0 ` for conductors carrying unequal currents in same direction.
    D
    `B_1 =B_2` for conductors carrying equal current in same directions at distance x and 2x from the axis respectively.

  • If n, e, t and m respectively represent the density, charge, relaxation time and mass of the electron, then the resistance of a wire of lengh / and area of cross-section A will be

    A
    `(ml)/("ne"^2tA)`
    B
    `(mr^2A)/("ne"^2l)`
    C
    `("ne"^2rA)/(2ml)`
    D
    `("ne"^2A)/(2mrl)`

  • The charge flowing in a conductor varies with time as Q=at 1/2bt^2+(ct^2)/6 where a, b, c are positive constants. Then the current

    A
    has an initial value a.
    B
    reaches a minimum value after time `b/c`
    C
    reaches a maximum value after time `b/c`
    D
    has either a maximum or a minimum value `(a-b^2/(2c))`

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    Define relaxation time of the free electrons drifting in a conductor.How is it related to the drift velocity of free electrons? Use this relation to deduce the expression for the electrical resistivity of the material.

    Using the concept of free electrons in a conductor, derive the expression for the conductivity of a wire in terms of number density and relaxation time. Hence obtain the relation between current density and the applied electric field E.

    Resistance of a conductor is twice that of another conductor and the potential differences between the two ends of the two conductors are same. Find the ratio of strengths of currents flowing through them.

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