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If a constant potential difference is ap...

If a constant potential difference is applied across a bulb, the current slightly decreases as time passes and then becomes constant. Explain.

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Knowledge Check

  • If the potential difference V applied across a conductor increases to 2V, drift velocity of the electron be

    A
    doubled
    B
    halved
    C
    tripled
    D
    no change

  • Ametallic block has no potential difference applied across it, then mean velocity of free electrons is

    A
    proportional to T
    B
    proportional for `sqrt(T)`
    C
    finite but independent of temperature
    D
    zero

  • Across a metallic conductor of non-uniform cross-section a constant potential difference is applied Which one of the following statements is correct? Along the conductor,

    A
    drift velocity remains constant
    B
    current remains constant
    C
    electric field remains constant
    D
    current density remains constant

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