Question

why do the diverged leaves of an electroscope fall back on touching the top of the metal rod with hand?? explain.....

Answer 1

Because when we touch it by hand Charles flow from the electroscope to our hands since charges from a value from a higher to lower . Therefore the diverged leaves of electroscope fall back on touching with hands.
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Answer 2

Answer:

When we touch the electroscope with hand when the leaves are diverged, the charges travel through our body into the ground and thus the leaves fall back into their original position. This phenomenon is called Earthing.