Q:Background: Our knowledge of electromagnets developed from a series of observations. In 1820, Hans Oersted discovered that a current-carrying wire produced a magnetic field. Later in the same year, Andre-Marie Ampere discovered that a coil of wire acted like a permanent magnet and Francois Arago found that an iron bar could be magnetized by putting it inside of a coil of current-carrying wire. Finally, William Sturgeon found that leaving the iron bar inside the coil greatly increased the magnetic field. Paragraph: Mark is doing an experiment creating a magnet. He takes a piece of iron named iron bar A and wraps it in a coil of copper wire. After that he puts an electric current through the copper for about an hour. Given the paragraph above, please answer correctly the following question: Will leaving an iron bar wrapped in copper wire carrying a current cause the bars magnetic field to increase or decrease?
A:
increase