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The force acting between two point charg...

The force acting between two point charges `q_(1)` and `q_(2)` kept at some distance apart in air is attractive or repulsive, if
`(i) q_(1)q_(2) gt 0" " (ii) q_(1)q_(2) lt 0`

Text Solution

Verified by Experts

(i) `q_(1)q_(2) gt 0` means either both charges are positive or negative. So, due to same nature, there is a repulsive force between them.
(ii) `q_(1)q_(2) lt 0` means one charge is positive and other charge is negative. So, due to opposite polarity, there is an attractive force between them.
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Knowledge Check

  • Force F between charges Q_(1) and Q_(2) separated by r is 25 N. It can be reduced to 5 N, if separation between them is made of

    A
    `(r )/(sqrt(5))`
    B
    `(r )/(2)`
    C
    2r
    D
    `sqrt(5)r`

  • The electrostatic force between two charges Q_(1) and Q_(1) separated by a distance r is given by F="k"(Q_(1)Q_(2))/(r^(2)) . The constant k depends on

    A
    the system of units only
    B
    the medium between the charges only
    C
    Both (a) and (b)
    D
    None of the above

  • Force F between charges Q_(1) and Q_(2) separated by r is 25 N . It can be reduced to 5 N if the separation between them is made

    A
    `r/Sqrt 5`
    B
    `r/2`
    C
    `2r`
    D
    `Sqrt 5r`

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