Question

how can we get a negatively charged body in the laboratory​

Answer 1

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In the induction process of charging, a charged object is brought near to but not touching the electroscope. The presence of the charged object above the plate of the electroscope, induces electrons within the electroscope to move accordingly.

HOpe iT HelP YOu DEaR

Answer 2

Answer:

Our skin, or human body is a good eternal source of electrons, which are negatively charged.

So, this is one experiment that I did in our laboratory where we used Acetyl strips which are actually more of the positive dipole philic.

And hence to test our demonstrations pf attraction or repulsion we used to just touch these strips once or twice and then these used to attract the other acetyl strips which were already positively charged , which meant that as these strips were touched by us, they has been given negative charges, and just as this strip would touch the other acetyl strips and give away the electrons to the other acetyl strip again, it would repel because now again after a second of contact both of these strips were positively charged and this would go on !

All of this that we used to was called as a process known as induction of charges that I got to know formally much later.

Hope this helps you ! ｡◕‿◕｡