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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

  • When a potential difference is applied across, the current passing through

    A
    an insulator at 0 K is zero
    B
    a semiconductor at 0 K is zero
    C
    a metal at 0 K is finite
    D
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    A
    the wavelength of the `K_(alpha)`line will increase
    B
    the wavelength of the `K_(beta)` line will decrease
    C
    the difference in wavelegth between the `K_(alpha)and K_(beta)` lines will decrease
    D
    none of the above

  • If the potential difference applied across a Coolidge tube is increased , then

    A
    wavelength of `K_(alpha)` will increase
    B
    `lambda_(min)` will increase
    C
    different between wavelength of `K_(alpha)` and `lambda_(min)` increase
    D
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