How to give the spheres exactly equal but opposite charges? Make sure spheres ar

Question

How to give the spheres exactly equal but opposite charges? Make sure spheres are not in contact with each other. Rub the glass rod on the silk to charge the rod positively (hence to charge piece of silk negatively). Bring the rod near, but not touching, one of the spheres. Do the same with piece of silk and another sphere. Remove the galss rod and the piece of silk. Make sure spheres are not in contact with each other. Rub the glass rod on the silk to charge the rod positively (hence to charge piece of silk negatively). Touch one of the spheres with the glass rod then touch another one with the piece of silk. Put the two metal spheres in contact with each other. Then rub the glass rod on the silk to charge the rod positively (hence to charge piece of silk negatively). Touch one of the spheres with the glass rod then separate the spheres. Touch another sphere with the piece of silk. Put the two metal spheres in contact with each other. Then rub the glass rod on the silk to charge the rod positively (hence to charge piece of silk negatively). Bring the rod near, but not touching, one of the spheres. Separate the spheres and remove the rod.

Explanation / Answer

ANS :- (4)

i.e put the two metal spheres in contact with each other. then rub the glass rod on the silk to charge the rod positively.. bring the rod near, but not touching, one of the spheres. separate the spheres and remove the rod.

explanation:- Consider two spheres A and B in contact with each other. Now a glass rod is rubbed with silk and hence the rod aquires a positive charge. This glass rod is brought near(but not in contact) sphere A. Some of the electrons in this sphere getsaccumulated towards the area near the glass rod leading to the formation of a negative charge. The other sphere B will then aquire a positive charge in the opposite diction as the negative charge in A. This happens so that the spheres are stable and are in an euuilibrium.

The glass rod is not removed(on removing the glass rod, the spheres will become neutral again) and the spheres are then separated by a small distance. The spheres will then attract each other(as they have equal and opposite charge on them).

Then the glass rod is removed

If the spheres are separated by some finite large distance then the charges on them will spread uniformly throughout the sphere.

These spheres should be of same material, mass, etc.

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