Question

how will you detect the presence and nature of charge on a body with an electroscope

Answer 1

 negative charges in the metal of the scope move toward the positive object, causing the leaves to have a positive charge, and the leaves repel each other. when a negatively charged object is brought near the metal end OF THE SCOPE the negative charges on the  in the metal of the scope travel to the leaves, which both become negatively charged and repel each other. When a positively charged object is brought near the electroscope.