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Question:

Two metallic spheres A and B kept on insulating stands are in contact with each other. A positively charged rod P is brought near 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?

Solution:

This process is called induction of charge and happens instantly. Separate the spheres by a small distance while the glass rod is still near sphere A. The two spheres will be oppositely charged and attract each other and after removing the rod they will rearrange each other.