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A small uncharged sphere is placed in co...

A small uncharged sphere is placed in contact with an equal and similar charged sphere and then removed to a distance of 4 cm. The force of repulsion between them is now `9xx10^(-5)`N. What was the original charges in the charged sphere?

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NN GHOSH-ELECTRIC FIELD AND POTENIAL-EXERCISE
  1. Two charges of +4 xx 10^(-7)C and -8 xx 10^(-7)C are 20cm apart. Find ...

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  2. A negative charge q(1)=50 xx 10^(-9)C and a positive charge q(2)=25 xx...

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  3. Two pith balls,, each weighting 10mg are suspended from the sam point ...

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  4. A ball of mass m=0.5kg is suspended by a thread and a charge q=0.1muC ...

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  5. An alpha paritcle carrying an electric charge 3.2 xx 10^(-19)C is at a...

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  6. A charges of 50 xx 10^(-9)C is placed at a point P. What amount of wor...

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  7. A small uncharged sphere is placed in contact with an equal and simila...

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  8. An electron is projected with an initial velocity of 10^(7)ms^(-1) int...

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  9. A positive point charge 50mu C is located in the plane xy at a point w...

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  10. Charges of +q,+2q,+q and -q, are placed at the cornersof a square ABCD...

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  11. Two small equal spheres carrying unlike and unequal charges are placed...

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  12. Two small conducters 0.3 m apart carry 10xx10^(-9)C and 20xx10^(-9)C o...

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  13. An electron of mass 9xx10^(-31) kg carrying 1.6xx10^(-19)C starts from...

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  14. Calculate the radius of a drop of water which remains suspended in the...

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  15. ABCD is a square of side 0.2 M. Positive charges 2xx10^(-9)C,4xx10^(-9...

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  16. Two charges +2xx10^(-9)C and -8xx10^(-9)C are placed 0.3 M apart in ai...

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  17. Two charges 4 cm apart repel each other with a force of 2xx10^(-2)N in...

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  18. Charges of magnitude (1)/(2),(2)/(3),(3)/(3) and (4)/(3) nanocolumb ar...

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  19. Four small spheres carrying +(5)/(3),+(10)/(3),+(5)/(3) and -(5)/(3)nC...

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  20. An electron is liberated from a hot filament and attracted by an anode...

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