It is observed that after rubbing the bar, the particles adhere but immediately afterwards they move away. Briefly explain the mechanism in this case attraction and repulsion between particles.
Let a negatively electrified rod is brought closer to a piece of paper, opposite electric charges appear on piece of paper near to the road there by positive charges in the paper to the other side due to electrostatic induction. Once the rod comes in contact with the paper charges can flow between it and the paper. This will neutralized the excess charge on the paper's near side, leaving the piece with a net charge of its own, which will then repel the rod, making the paper fly away.
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