If you bring a charged rod near dry cork dust, the rod attracts cork dust and then on touching the rod these cork dust particles are repelled away from the rod. Explain it.

Explanation

Charged rod attracts the cork dust particles due to induction of opposite charge on the nearby particles. Opposite charge on the particles being near charged rod, they are attracted. But on touching the rod they also receive some amount of charge carried by rod, which is of the same polarity as that of the charge on the rod. Thus, these particles are repelled away due to repulsion between like charges