A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is near to it. The rod is then removed. Which statement is correct?
The cap will be positively charged and the leaf will be negatively charged
The cap will be negatively charged and the leaf will be positively changed
The cap and the leaf will be positively charged
The cap and the leaf will be negatively charged
none
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Greetings, The Myschool Team.
The correct answer is C (The cap and the leaf will be positively charged) and not D(The cap and the leaf will be negatively charged). The process described is charging by induction. In charging by induction, the material to be charged acquires a different polarity from the charged material. Since the rod is negatively charged, the cap will acquire a positive charge. The charge induced on the cap diffuses to the leaves. Overall, the process is best described by C(The cap and the leaf will be positively charged), making it the correct answer. Thank you.
my school is correct ...if a positively charged rod is brought near the cap of an electroscope the entire equipment will be positively charged
And if a negatively charged rod is brought near the cap the entire electroscope will be negatively charged.
