Post-UTME Physics 2018 Objective — Question 17
Question 17 of 20 from the Post-UTME Screening (Post-UTME) Physics 2018 Objective paper, with the correct answer and a full explanation.
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Which of the following statements about a charged electroscope are correct? I. when a negatively charged object is brought close to a negatively charged electroscope, the divergence increases. II. When a positively charged object is brought close to a negatively charged electroscope, the divergence decreases. III. When an uncharged object is brought close to a negatively charged electroscope, the divergence decreases.
- A. I and II onlyCorrect
- B. II and III only
- C. I and III only
- D. I, II and III
Explanation
Bringing a like (negative) charge closer increases divergence (repulsion); bringing an opposite (positive) charge closer decreases divergence; an uncharged object has negligible direct effect (statement III is not generally correct).
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