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How can a metallic sphere be charged neg...

How can a metallic sphere be charged negatively without touching it ?

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By bringing positively charged rod near metallic sphere)
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A charged metallic sphere A is suspended by a nylon thread. Another charged metallic sphere B held by an insulating handle is brought close to A such that the distance between their centres is 10 cm, as shown in figure (a). The resulting repulsion of A is noted (for example, by shining a beam of light and measuring the deflection of its shadow on a screen). Spheres A and B are touched by uncharged spheres C and D respectively, as shown in figure (b). C and D are then removed and B is brought closer to A to a distance of 5.0 cm between their centres, as shown in figure (c). What is the expected repulsion of A on the basis of Coulomb's law ? Spheres A and C and spheres B and D have identical sizes. Ignore the sizes of A and B in comparison to the separation between their centres.

A charged metallic sphere A is suspended by a nylon thread another charged metallic sphere b held by an insulating centers is 10 cm as shown in Fig. 1.7(a). The resulting repulsion of A is noted (for example, by shining a beam of light and measuring the deflection of its shadow on a screen). Spheres A and B are touched by uncharged spheres C and D respectively, as shown in Fig. 1.7(b). C and D are then removed and B is brought closer to A to a distance of 5.0 cm between their centers, as shown in Fig. 1.7(c). What is the expected repulsion of A on the basis of Coulomb’s law? Spheres A and C and spheres B and D have identical sizes. ignore the sizes of a and b in comparison to the separation between their centers

KUMAR PRAKASHAN-ELECTRIC CHARGES AND FIELDS -SECTION B NUMERICALS (NUMERICAL FROM TEXTUAL ILLUSTRATIONS)
  1. A charged metallic sphere A is suspended by a nylon thread. Another ch...

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  2. Consider three charges q(1),q(2), q(3) each equal to q at the vertices...

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  3. Consider the charges q, q and -q placed at vertices of an equilateral...

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  4. An electron falls through a distance of 1.5cm in a uniform electric fi...

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  5. Two point charges q(1) and q(2) of magnitude + 10^(-8) c and -10^(-8)...

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  6. Tow charges pm10 mu C are placed 5.0 mm apart determine the electri...

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  7. The electric field components are E(x)=ax^(-1//2),E(y)=E(z)=0 in whi...

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  8. An electric field is uniform and in the positive x direction for posit...

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  9. An early model for an atom considered it to have a positively charged ...

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  10. How can a metallic sphere be charged negatively without touching it ?

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  11. If 10^10 electrons move out of a body to another body every second, ho...

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  12. How much positive and negative charge is there in a 100 g water ? (Mol...

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  13. Charges on identical spheres A and B are equal. When the separation be...

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  14. + q, + q, - q and - q are kept at vertices of square ABCD respectively...

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  15. Four equal point charges of 16 muC are kept at vertices of square of ...

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  16. An electron falls through a distance of 2 cm ir a uniform electric fie...

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  17. Two charges of dipole +- 10 mu C are placed 1mm apart. Determine the ...

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  18. The electric field components in figure are E(x) =ax, E(y) = E(z) =0 ...

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  19. If the electric field components due to electric charge in cube sho...

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  20. A hollow cylinder is kept in 3-dimensional coordinate system of lm len...

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