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(a) Two insulated charged copper spheres...

(a) Two insulated charged copper spheres a and b have their centres separated by a distance of 50 cm what is the nutual force of electrostatic repulsion if the charge on each is `6.5 xx10^(-7)` c the radii of a and b negligible compared to the distance of separation
(b) what is the force of repuslion if each spere is charged double the above amount andf the distance between them is haved

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(a) `1.5 xx10^(2)` N
(b) 0.24 N
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NCERT BANGLISH-ELECTRIC CHARGES AND FIELDS -EXERCISES
  1. An electric dipole with dipole moment 4xx10^(-9) c m is aligned at 30^...

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  2. A polythene piece rubbed with wool is found to have a negative ch...

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  3. (a) Two insulated charged copper spheres a and b have their centres ...

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  4. Track of three charged particles in a uniform electroastatic field ...

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  5. Consider a uniform electric field E=3xx10^(3) hati N/C (a) what is ...

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  6. What is the net flux of the uniform electric field of exercise th...

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  7. Careful measurement of the electric field at the surface of a black b...

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  8. A point charge + mu c is a distance 5 cm directly above the centre of...

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  9. A point charge of 2.0 mu c is at the centre of a cubic gaussian ...

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  10. A point charge causes an elelctric flux of -1.0 xx10^(3) Nm^(2) /C to...

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  11. A conducting sphere of radius 10 cm has an unknown charge if the elect...

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  12. A uniformly charged conducting sphere of 2.4 m diameter has a surface ...

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  13. An infinite line charge produces a field of 9xx10^(4) N/C at a dis...

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  14. Two large thin metal plates are parallel and close to each other on...

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  15. An oil drop of 12 exess electrons is held stationary under a consta...

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  16. Which among the curves cannot possibly represent electrostatic fie...

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  17. In a certain region of space electric field is along the z direction...

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  18. (a) a conductor a with a cavity given a charge Q show that the enti...

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  19. A hollow charged conductor has a tiny hole cut in to its surface sho...

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  20. Obtain the formula for the electric field due to a long thin wire ...

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