Question: which property is used ti identify the electric charge on the object
[{'answer': 'Coulomb electrostatic force', 'provenance': [{'wikipedia_id': '706128', 'title': 'Electroscope', 'start_paragraph_id': 1, 'start_character': 170, 'end_paragraph_id': 1, 'end_character': 197, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]