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An oil drop of 12 exess electrons is h...

An oil drop of 12 exess electrons is held stationary under a constant eletric field of `2.55 xx10^(4) NC^(-1)` the density of the oil is 1.26 g `cm^(-3)` estimage the radius of the drop (g=9.81 m `s^(-2) e =1.60 xx10^(-19)` C)

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(a) zero ,(b) zero (c ) 1.9 N/C
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NCERT BANGLISH-ELECTRIC CHARGES AND FIELDS -EXERCISES
  1. (a) Two insulated charged copper spheres a and b have their centres ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  19. It is now established that protons and neutrons are themselves bui...

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  20. (a) consider an arbitrary electrostic field configuration a small tes...

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