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Point charges +4q, -q and +4q are kekpt ...

Point charges `+4q, -q` and `+4q` are kekpt 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 in unstable equilibrium

D

All the charges are in stable equilibrium

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The correct Answer is:
C
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DC PANDEY-ELECTROSTATIC POTENTIAL AND CAPACITORS-(A) Chapter exercises
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  6. Charge Q on a capacitor varies with voltage V as shown in the figure, ...

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  7. How many 1muF capacitors must be connected in parallel to store a char...

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  8. In the figure below, the capacitance of each capacitor is 3 muF. The e...

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  9. The 500 muF capacitor is charged at a steady rate of 100 mu C//s. The ...

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  10. A ball of mass 1g and charge 10^(-8) C moves from a point A. Where pot...

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  11. In the circuit shown in the figure, the potential difference across th...

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  12. Three capacitors of capacitances 1muF,2muF and 4muF are connected firs...

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  13. An electron moving with the speed 5xx10^(6) per sec is shot parallel t...

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  14. The electirc potential at a point (x, y, z) is given by V = -x^(2)y ...

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  15. Three charges -q,+Q and -q are placed in a straight line as shown ...

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  16. The mutual electrostatic potential energy between two protons which ar...

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  17. Three capacitor of capacitance C(mu F) are connected in parallel to wh...

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  18. Figure shows some equipotential lines distributed in space. A charge...

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  19. The electrostatic potential on the surface of a charged concducting sp...

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  20. Two conducting spheres of radii 3 cm and 1 m are separated by a distan...

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