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A fixed circle of radius a and cnetre ...

A fixed circle of radius a and cnetre O is drawn anda charge `+q_(1)` is placed at a distance `((3a)/(4))` from O on a line through O and perpendicular to plane of circle. And a second charge `q_(2)` is similarly placed at a distance `(5a)/(12)` on the opposite side of circle.

If the net flux through circle is zero, then `(q_(1))/(q_(2))` would be

A

1

B

`(13)/(20)`

C

`(20)/(13)`

D

`(2)/(9)`

Text Solution

Verified by Experts

The correct Answer is:
C
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A fixed circle of radius a and cnetre O is drawn anda charge +q_(1) is placed at a distance ((3a)/(4)) from O on a line through O and perpendicular to plane of circle. And a second charge q_(2) is similarly placed at a distance (5a)/(12) on the opposite side of circle. If the values of q_(1) and q_(2) are +q, - 2q respectively now a third charge -q has to be placed on line AB so that is can be stable equilibrium .The distance of point where third charge is placed from charge q, wouldbe ( take a= 12 cm ) .

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Knowledge Check

  • A point charge +q, is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is

    A
    directed perpendicular to the plane and away from the plane.
    B
    directed perpendicular to the plane but towards the plane.
    C
    directed radially away from the point charge.
    D
    directed radially towards the point charge.

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