1) What does the picture indicate? 2) Which does not belong to the group? 3) What is the resulting charge of the silk? 4) Which picture demonstrates charging by conduction? 5) What electric force does the picture indicate? 6) Which does not belong to the group? 7) What's inside the nucleus of the atom? 8) Which is stronger? 9) Complete the statement. 10) What electric force does the picture indicate?

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