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1. Touching the metal cap with a finger. The electrons flow to the earth if it is negatively charged or electrons flow from the earth if the electroscope is positively charged.
2. Putting a bare flame of a candle close to the cap. The flame ionises the air around the cap. The opposite charges to the electroscope are attracted neutralizing the charges hence discharging it.
3. Bringing the cap of the charged electroscope near water tap. Water contains positive and negative charges. The opposite charges to those of the electroscope are attracted neutralizing the charges. hence discharging it.
chrispohmomanyi answered the question on October 9, 2017 at 11:09
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