Physics Project Help

I have to make a Physics project on the topic-

“to estimate the charge induced on each one of the two identical styro foam(or pith) balls suspended in a vertical plane by making use of coulombs law.”

Please tell me how should i make it. Please help me.

(Requested by Sasha Grover. Expect a response from visitors)

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Physics Teachers with more than 15 years of teaching Physics to students up to Plus Two