a negative charge if it is made of glass and rubbed with silk
no charge if it is made of glass and rubbed with fur
no charge if it is made of copper and rubbed with silk
a positive charge if it is made of copper and rubbed with fur
Explanation
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Discussions (12)
when glass is rubbed with silk,it looses electron and beomes positively charged
and when rubbed with fur,it gains electrons and becomes negatively charged
1. Glass rod rubbed with silk
In reality: glass loses electrons to silk
So glass becomes positively charged, not negative
❌ Statement is incorrect
2. Glass rod rubbed with fur
Glass still tends to lose electrons
So it should become positively charged, not “no charge”
❌ Incorrect
3. Copper rod rubbed with silk
Copper is a conductor, so any charge produced flows away (especially if held)
So it appears to have no charge
✅ Correct
4. Copper rod rubbed with fur
Same idea: copper cannot hold charge easily
It should still show no charge, not positive
❌ Incorrect
✅ Final conclusion:
Only one correct statement:
👉 “No charge if it is made of copper and rubbed with silk.”
Quick rule to remember:
Insulators (like glass) → can hold charge
Conductors (like copper) → lose charge quickly
Glass + silk → positive charge on glass (very common exam fact)
If you want, I can give you a super simple table to memorize all the common charging pairs 👍
