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An iron ring is to be coated with copper...

An iron ring is to be coated with copper. How can we do this without using electricity ?

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Galvanisation
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Knowledge Check

  • An electric current is passed through silver nitrate solution using silver electrodes. 10.79 g of silver was found to be deposited on the cathode. If the same amount of electricity is passed through copper sulphate solution using copper electrodes, the weight of copper deposited on cathode is

    A
    6.4 g
    B
    3.2 g
    C
    12.8 g
    D
    1.6 g

  • A thin copper ring of radius a is charged with q units of electricity . An elctron is placed at the centre of the of electricity . An electron is placed at the centre of the copper ring . If the electron is displaced of a little , it will have frequency :

    A
    `1/(2pi) sqrt((eq)/(4piepsilon_(0)ma^(3)))`
    B
    `1/(2pi) sqrt(q/(4piepsilon_(0)ema^(2)))`
    C
    `sqrt((eq)/(4piepsilon_(0)ma))`
    D
    `sqrt(q/(4piepsilon_(0)ema^(3)))`

  • Two identical rods of copper and iron are coated with wax uniformly. When water, the length upto which wax melts are 8.4 cm and 4.2 cm respectively. If thermal conductivity of copper is 0.92 , then thermal conductivity of iron is :

    A
    `0.23`
    B
    `0.46`
    C
    `0.115`
    D
    `0.69`

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