Question: factors on which the speed of dc motor depends
[{'answer': 'armature resistance', 'provenance': [{'wikipedia_id': '10004115', 'title': 'Brushed DC electric motor', 'start_paragraph_id': 77, 'start_character': 600, 'end_paragraph_id': 77, 'end_character': 619, 'bleu_score': 1.0, 'section': 'Section::::Torque and speed characteristics.:Series wound motor.\n'}]}, {'provenance': [{'wikipedia_id': '10004115', 'title': 'Brushed DC electric motor', 'start_paragraph_id': 77, 'start_character': 0, 'end_paragraph_id': 77, 'end_character': 1115, 'bleu_score': 0.9896637358043451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8430022148540908411}, 'section': 'Section::::Torque and speed characteristics.:Series wound motor.\n'}]}]