Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Electric charge is a physical property of particles or objects that causes them to attract or repel each other without touching. All electric charge is based on the protons and electrons in atoms. A proton has a positive electric charge, and an electron has a negative electric charge (see Figure below ). Answer: positive
A:
What kind of charge does a proton have?