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Four point charges each '+q' is placed o...

Four point charges each '+q' is placed on the circumference of a circle of diameter 2d in such a way that they form a square. The potential at the centre is

A

0

B

`(4q)/d`

C

`(4d)/q`

D

`q/(4d)`

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Knowledge Check

  • Four point changes each +q is placed on the circumference of a circle of diameter 2d in such a way that they form a square. The potential at the centre of the circle (in CGS) is

    A
    0
    B
    `(4q)/d`
    C
    `(4q)/q`
    D
    `q/(4q)`

  • Four point charges -Q, -q, 2q and 2Q are placed, one at each comer of the square. The relation between Q and q for which the potential at the centre of the square is zero is.

    A
    Q = -q
    B
    `Q=-1/q`
    C
    Q = q
    D
    `Q=1/q`

  • Three point charges each equal to q are placed on the vertices of an equilateral triangle of side l. The potential energy of the system is

    A
    `1/(4 pi epsilon_(0))(q^2)/(l)`
    B
    `1/(4 pi epsilon_(0))(2q^2)/(l)`
    C
    `1/(4 pi epsilon_(0))(3q^2)/(l)`
    D
    `1/(4 pi epsilon_(0))(4q^2)/(l)`

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    The distance of the point from the centre of a circle with diameter of 16 cm is 17 cm. Then the length of the tangent from the point to the circle is

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