A positively charged insulator is brought near two metallic spheres that are in contact

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Ifyou bring a negatively charged insulator near two uncharged metallic spheres that are in contact and then separate the spheres, the sphere on theright will have no net charge_ None of these is correct: positive charge_ negative charge; either positive or negative charge_

Two metallic spheres A and B kept on insulating stands are in contact with each other. A positively charged  rod P is brought near the sphere A as shown in the figure. The two spheres are separated from each other,  and the rod P is removed. What will be the nature of charges on spheres A and B?

On sphere A there will be negative charge & one sphere B there will be positive charge 

When we bring a positively charged rod near the sphere A, The free electrons in the spheres are attracted to the rod. This leaves an excess of positive charge on the farther surface of sphere B. Now after separating the spheres and removing the rod, the charges on spheres rearrange themselves and get uniformly distributed over them, as shown in Figure given below.

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Page 2

A metal sphere is kept on an insulting stands. A negatively charged rod is brought near it, then the sphere is  earthed as shown. On removing the earthing, and taking the negatively charged rod away, what will be the  nature of charge on the sphere? Give reason for your answer. 

There will be positive charge on the sphere. 

Reason :
Negatively charged rod will induce positive charge on the sphere and negative charge well move in  ground from other end.

When we bring a negatively charged rod near the metal sphere, the free electrons in the sphere move away due to repulsion force and start piling up at the other end. The rear end becomes positively charged due to the deficit of electrons. After connecting the sphere to the ground, the electrons flow to the ground while the positive charges at the rear end remain as it is due to the attractive force of the negative charges on the rod. When the sphere is disconnected from the ground and the charged rod is removed, the positive charge spreads uniformly over the sphere as shown in the Figure below:

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Text Solution

no net chargea negative chargea positive chargeeither a negative or a positive charge.

Answer : C

Solution : The positively charged insulator pulls the free electron in sphere towards left till electrostatic equilibrium is reached. Hence if both sphere are now separated the sphere `II` has deficiency of electrons, i.e., it has Positive charge <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/BMS_OBJ_XII_C01_E01_008_S01.png" width="80%">