Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Electricity and magnetism are inextricably linked. Under certain conditions, electric current causes a magnetic field. Under other conditions, a magnetic field can cause an electric current. A moving charged particle creates a magnetic field around it. Additionally, when a moving charged particle moves through a different magnetic field, the two magnetic fields will interact. The result is a force exerted on the moving charged particle. Answer: magnetic
A:
Under certain conditions, electric current causes what type of field?