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Four point +ve charges of same magnitude...

Four point +ve charges of same magnitude (Q) are placed at four corners of a rigid square frame as shown in fig.The plane of the frame is perpendicular to Z-axis. If a –ve point charge is placed at a distance z away from the above frame then :

A

–ve charge oscillates along the Z-axis

B

it moves away from the frame

C

it moves slowly towards the frame and stays in the plane of the frame

D

It passes through the frame only one

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The correct Answer is:
A
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Knowledge Check

  • Four identical thin rods each of mass M and length l from a square frame. Moment of inerita of this frame about an axis through the centre of the square and perpendicular to its plane is ……………

    A
    `(2)/(3)Ml^(2)`
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    C
    `(1)/(3)Ml^(2)`
    D
    `(4)/(3)Ml^(2)`

  • Four identical thin rods each of mass M and length l, form a square frame. Moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is …………

    A
    `(2)/(3)Ml^(2)`
    B
    `(13)/(3)Ml^(2)`
    C
    `(1)/(3)Ml^(2)`
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