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What is the force between two small char...

What is the force between two small charged spheres having charges of `2 xx 10^(-7)C` and `3 xx 10^(-7)` C placed 30 cm apart in air ?

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`F = k(q_(1)q_(2))/(r^(2))`
`F = (9 xx 10^(9))(2 xx 10^(-7))(3 xx 10^(-7))/(0.3)^(2)`
`F = 6 xx 10^(-3)` N
Here, two given charges are like charges and so above force is repulsive.
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KUMAR PRAKASHAN-ELECTRIC CHARGES AND FIELDS -SECTION B NUMERICALS (NUMERICAL FROM TEXTUAL EXERCISES)
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  2. The electrostatic force on a small sphere of charge 0.4 muC due to an...

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  3. Check that the ratio (ke^(2))/(Gm(e)m(p)) is dimensionless. Look up a...

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  4. (a) explain the menaing of the statement electric charge of a body...

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  5. When a glass rod is rubbed with a silk cloth, charges appear on both. ...

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

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  7. (a) An electrostatic field line is a continuous curve. That is, a fiel...

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  8. Two point charges q(A) =3 muC and q(B) = -3 muC are located 20 cm apa...

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  9. A system has two charges qA = 2.5 xx 10^(-7) C and q(B) = - 2.5 xx 1...

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  10. An electric dipole with dipole moment 4 xx 10^(-9) Cm is aligned at 30...

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  11. A polythene piece rubbed with wool is found to have a negative charge ...

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

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

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  14. Figure shows tracks of three charged particles in a uniform electrosta...

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

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

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  17. Careful measurement of the electric field at the surface of a black bo...

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

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  19. A point charge of 2.0 muC is at the centre of a cubic Gaussian surface...

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

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