A charged comb attracts small pieces of paper, but after some time they fall off. Why does this happen?
چارج شدہ کنگھی کاغذ کے چھوٹے ٹکڑوں کو کھینچتی ہے مگر کچھ دیر بعد وہ گر جاتے ہیں۔ ایسا کیوں ہوتا ہے؟
Solution & explanation
The field polarises neutral paper so the nearer opposite charge is attracted more strongly. Contact can transfer charge or allow leakage, reducing attraction or producing repulsion; gravity then wins.
Independent study answer. Original textbook ↗ · English-medium printed page 102–103.