Question

How is an electromagnetic field produced?

A. When a current runs through a conductor
B. When an object has an electrical charge
C. When a conductor interacts with a magnet
D. When particles are arranged around a conductor

Answer 1

An electromagnetic field is produced primarily in the following way:

**A. When a current runs through a conductor**

When an electric current flows through a conductor, it generates a magnetic field around the conductor. This is a fundamental principle of electromagnetism, explained by Ampère's Law. While options B (an electrically charged object) and C (interaction between a conductor and a magnet) can also lead to electromagnetic effects, they don't directly describe the primary production of an electromagnetic field as option A does. Option D is less relevant in the context of generating an electromagnetic field.

So, the best answer is **A**.