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How much positive and negative charge is there in a cup of water

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Let us assume that the mass of one cup of water is 250 g the molecular mass of water is 18 g thus one mole of water is 18 g therefore the number of molecules in one cup of water is `(250//18)xx6.02 xx10^(23)` each molecule of water contains two hydrogen atoms and one oxygen total negative charge has the same magnitude it is equal to `(250//18)xx6.02 xx10xx1.6 xx10^(-10^(-19) C=1.34 xx10^(7)C`
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NCERT BANGLISH-ELECTRIC CHARGES AND FIELDS -EXERCISES
  1. How much positive and negative charge is there in a cup of water

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  2. What is the force between two small charged speres having charges of ...

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  3. The electrostatic force on a small sphere of charge 0.4 muC due to ...

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  4. Check that the ratio ke^(2) /G m(e )m(p) is dimensionaless look up a...

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  5. When a galss rod is rubbed with a sild cloth charges appear on both...

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  6. Four point charges q(A) =2 mu C ,q(B )=-5 mu C, q(c )=2 mu C and q(...

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  7. Two point charges q(A) =3 mu c and q(B)=-3 mu c are located 20 cm ...

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  8. A system has two charges q(A)=2.5 xx10^(-7) c and Q(B)=-2.5 xx10^(-7) ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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