4. A metal sphere is grounded through a switch, and a positively charged balloon is brought near it. The switch is opene
Posted: Wed Jul 06, 2022 11:40 am
4. A metal sphere is grounded through a switch, and a positively charged balloon is brought near it. The switch is opened and the balloon is taken away. The sphere is now (a) neutral (b) negatively charged (c) positively charged (d) charged, but we cannot know its polarity