Question

how are electric fields and magnetic fields related?
○ a stationary charge
○ a changing electric field creates a magnetic field
○ static friction
○ opposites attract

Explanation:

To determine the relationship between electric and magnetic fields, we analyze each option:

• "a stationary charge": A stationary charge only produces an electric field, not a magnetic field, so this is incorrect.
• "a changing electric field creates a magnetic field": According to Maxwell's equations, a changing electric field (or a time - varying electric field) generates a magnetic field. This is a fundamental principle of electromagnetism that describes the relationship between electric and magnetic fields.
• "static friction": Static friction is a concept in mechanics related to the force between two surfaces at rest relative to each other, and it has nothing to do with electric and magnetic fields.
• "opposites attract": This is a principle related to electric charges (opposite charges attract) or magnetic poles (opposite poles attract), but it does not describe the relationship between electric and magnetic fields.

Answer:

a changing electric field creates a magnetic field