When the pointed end of an uncharged optical pin is brought near the cap cf a positively charged electroscope, it is observed that the gold
collapse slowly
vibrate
are not affected
diverge rapidly
Explanation
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The correct answer is: C. are not affected
Explanation:
An uncharged optical pin has no net charge, so it does not influence the electric field around the positively charged electroscope.
The gold leaves of the electroscope diverge because they both have positive charges, which repel each other.
Bringing an uncharged object near the cap does not add or remove charge, so the leaves remain unaffected.
Correct option: C. are not affected
The correct answer is: C. are not affected
Explanation:
An uncharged optical pin brought near the cap of a positively charged electroscope will not affect the gold leaves because:
The pin does not carry any charge, so it cannot induce any redistribution of charge in the electroscope.
The electroscope remains positively charged, and there’s no external influence to alter the charge distribution.
So:
No attraction or repulsion occurs.
The gold leaves remain in their diverged state (due to like positive charges repelling).
👉 Correct answer: C. are not affected
The correct answer is option: Collapse slowly
This is what actually happens:
Electroscope positively charged → leaves diverged.
· Bring an uncharged conductor (optical pin) near the cap.
· The presence of the conductor polarizes (charges separate inside it) due to the electric field of the cap.
· Negative charges in the pin are attracted toward the cap, so the near end of the pin becomes negative.
· This induced negative charge on the pin attracts positive charges in the electroscope toward the cap.
· Positive charges move from leaves to cap, reducing the positive charge on the leaves.
· Leaves slowly collapse
