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A charge q is placed at the centre of th...

A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to:

A

`-Q//2`

B

`-Q//4`

C

`+Q//4`

D

`+Q//2`

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium then the value of q is

    A
    (a) `Q/2`
    B
    (b) `-Q/2`
    C
    (c) `Q/4`
    D
    (d) `-Q/4`

  • A charge q is placed at the center of the line joining two equal charges Q . Three charges are in equilibrium then what will be the value of 'q' ?

    A
    `(Q)/(4)`
    B
    `(-Q)/(4)`
    C
    Q
    D
    `(-Q)/(8)`

  • Two point charges q_(1) = +2 C and q_(2) = - 1C are separated by a distance d . The position on the line joining the two charges where a third charge q = + 1 C will be in equilibrium is at a distance

    A
    `(d)/(sqrt(2))` from `q_(1)` and `q_(2)`
    B
    `(d)/(sqrt(2))` from `q_(1)` away from `q_(2)`
    C
    `(d)/(sqrt(2) - 1)` from `q_(2)` between `q_(1)` and `q_(2)`
    D
    `(d)/(sqrt(2) - 1)` from `q_(2)` away from `q_(1)`

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