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Can one coil have an inductance without ...

Can one coil have an inductance without a resistance?

Text Solution

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No. Every material of the coil has some resistance.
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An inductor-coil of inductance 20 mH having resistance 10 Omega is joined to an ideal battery of emf 5.0 V. Find the rate of change of the induced emf at t=0, (b) t = 10 ms and (c ) t = 1.0s.

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Knowledge Check

  • The power factor of a choke coil having inductance L and resistance r is given by :

    A
    `sqrt(r^(2)+omega^(2)L^(2))`
    B
    `sqrt((r^(2)+omega^(2)+L^(2))/(r ))`
    C
    `(r )/(sqrt(r^(2)omega^(2)L^(2)))`
    D
    `r^(2)+omega^(2)L^(2)`

  • The self inductance of a coil is

    A
    directly proportional to N
    B
    inversely proportional to N
    C
    directly proportional to `N^(2)`
    D
    inversely proportional to `N^(2)`

  • The power generated by a choke coil having resistance r, inductance L is given by:

    A
    `E_("rms")I_("rms")`
    B
    `(E_(0)I_(0))/(2)`
    C
    `E_("rms")I_("rms")(r )/(sqrt(r^(2)+omega^(2)L^(2))`
    D
    `E_(0)I_(0)(r )/(sqrt(r^(2)+omega^(2)+L^(2)))`

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