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A polythene piece rubbed with wool i...

A polythene piece rubbed with wool is found to have a negative charge of `3xx10^(-7)` c
(a) estimate the number of electrons transferred (from which to which )
(b) is there a transfer of mass from woool to polythene

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(a) `2xx10^(12)` form wool to polythene
(b) yes but of a negligible amount (`=2xx10^(-18)` kg in the example )
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NCERT GUJARATI-ELECTRIC CHARGES AND FIELDS -EXERCISES
  1. A system has two charges q(A)=2.5 xx10^(-7) c and Q(B)=-2.5 xx10^(-7) ...

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  2. An electric dipole with dipole moment 4xx10^(-9) c m is aligned at 30^...

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

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

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  5. Suppose the spheres A and B in Exercise 1.12 have identical sizes. A t...

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

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

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

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

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

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

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

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

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  14. A uniformly charged conducting sphere of 2.4 m diameter has a (a)...

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

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

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

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

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

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

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