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How does drift velocity of electrons in ...

How does drift velocity of electrons in a metallic conductor vary with increase in temperature ? Give reason.

Text Solution

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On heating a conductor its resistance increases and the current decreases. Consequently, the drift velocity of free electrons decreases.
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(i) Derive an expression for drift velocity of free electrons. (ii) How many drift velocity of electrons in a metallic conductor vary with increase in temperature ? Explain.

Why does resistance of a metallic conductor increase with increase in temperature?

Knowledge Check

  • The drift velocity of electrons is given by

    A
    `v_(d)=(e)/(m)(V)/(l)t`
    B
    `v_(d)=(eV t)/(l)`
    C
    `v_(d)=(e)/(m)t`
    D
    `v_(d)=(V)/(l)(m)/(e)t`

  • Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire decreases.

    A
    If both assertion and reason are ture and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion and reason both are false.

  • Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire decreases.

    A
    If both assertion and reason are ture and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion and reason both are false.

    • Similar Questions

    Explore conceptually related problems

    How does the conductivity of a metallic conductor vary with temperature?

    How does the resistivity of : (i) a conductor and (ii) a semiconductor vary with temperature ? Give reason for each case.

    How does the resistivity of (i) a conductor and (ii) a semiconductor vary with temperature? Give reason for each case.

    STATEMENT-1 : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. and STATEMENT-2 : On increasing the temperature of the wire , conductivity of metallic wire decreases.

    The resistance of a metallic conductor increases with temperature due to.

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