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How many electrons must be removed from ...

How many electrons must be removed from a piece of metal to give it a positive charge of `1.0 xx 10^(-7)C`.

A

`6.25 xx 10^11`

B

`62.5 xx 10^(11)`

C

`6.25 xx 10^(-11)`

D

`6.25 xx 10^(11)`

Text Solution

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The correct Answer is:
A
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A Solid contains 5 xx 10^(21) number of atoms. If an electron is removed from each of 0.01% of number of atoms, find the charge gained by this solid?

Knowledge Check

  • Two identical copper spheres are separated by 1m in vacuum. How many electrons would have to be removed from one sphere and added to the other so that they now attract each other with a force of 0.9N?

    A
    `6.25 xx 10^15`
    B
    `62.5 xx 10^15`
    C
    `6.25 xx 10^13`
    D
    `0.65 xx 10^13`

  • Two identical copper spheres are separated by 1m in vacuum. How many electrons would have to be removed from one sphere and added to the other so that they now attract each other with a force of 0.9N?

    A
    `6.25 xx 10^(15)`
    B
    `6.25 xx 10^(15)`
    C
    `6.25 xx 10^(13)`
    D
    `0.65 xx 10^(13)`

  • The number of significant figures in electronic charge 1.602 xx 10^(-19)C

    A
    1
    B
    2
    C
    3
    D
    4

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