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Point charges +4q, -q are kept on the x-...

Point charges `+4q, -q` are kept on the `x`-axis at points `x=0,x=a` and `X=2a` respectively, then

A

only `-q` is in stable equilibrium

B

none of the charges are in equilibrium

C

all the charges are unstable equilibrium

D

all the charges are in stable equilibrium

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CP SINGH-ELECTROSTATICS-Exercises
  1. In the previous question , the equilibrium is

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  2. Consider two identical charges placed a distance 2 d apart on the x-ax...

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  3. Point charges +4q, -q are kept on the x-axis at points x=0,x=a and X=2...

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  4. In the following diagrams a particle with small charge -q is free to m...

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  5. Three point charges are placed at the corner of an equilateral triangl...

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  6. Two points charges Q(1) and Q(2) placed at separation d in vacuum and...

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  7. Two identical simple pendulums, A and B are suspended from the same po...

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  8. Two small balls having equal poistive charges Q( coulomb) on each are ...

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  9. In previous question , the tension in each string is

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  10. Two identical charges +Q are kept fixed some distance apart.A small pa...

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  11. Two point charges q(1) = 4 mu C and q(2) = 9 mu C are placed 20 cm apa...

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  12. Three charges ,each of + 4 mu C ,are placed at the corners A,B,C of a ...

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  13. Four particles each having a charge q, are placed on the four vertices...

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  14. In a regular polygon of n sides, each corner is at a distance r from t...

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  15. A wire is bent in the form of a regular hexagon and a total charge q i...

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  16. A circular wire-loop of radius a carries a total charge Q distributed ...

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  17. A point charge is brought in an electric field. The electric field at ...

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  18. Figure below show regular hexagons with charges at the vertices. In w...

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  19. Four point +ve charges of same magnitude(Q) are placed at four corners...

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  20. A proton and an electron are placed in a uniform electric field.

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