WAEC - Physics (1992 - No. 40)
A negatively charged rod is brought near the cap of a gold-leaf electroscope. The cap is earthed momentarily while the rod is near to it. The rod is then removed. Which of the following is correct?
The cap will be positively charged and the negatively charged leaves will diverge
The cap will be negatively charged and the positively charged leaves will diverge
The cap and the leaves will be positively charged
The cap and the leaves will be negatively charged.
The leaves will not diverge because the cap has been earthed.