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Chapter 18: Q5CQ (page 661)

When a glass rod is rubbed with silk, it becomes positive and the silk becomes negative鈥攜et both attract dust. Does the dust have a third type of charge that is attracted to both positive and negative? Explain.

Short Answer

Expert verified

No, the dust particle does not have a third type of charge; it is attracted to both because the dust particle molecules become polarized in the direction of glass rod or silk.

Step by step solution

01

Charging by rubbing

When silk is rubbed on a glass rod, the rod loses electrons and becomes positively charged. On the other hand, silk gains electrons becoming negatively charged.

02

Attraction of the dust particle

When a positively charged glass rod is placed near the dust particle, the dust particle gets polarized. The neutral dust particles become negatively charged due to polarization and get attracted toward the rod. Becoming negatively charged while the opposite face acquires an equal positive charge, ensuring the neutrality of dust particles while still being attracted to the rod.

When a negatively charged silk is placed near the dust, the positive charges in the neutral dust particles get accumulated towards the silk, becoming positively charged, while the opposite face acquires an equal negative charge, ensuring the neutrality of dust particles while still being attracted to the silk.

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