Electromagnetism Questions & Answers

Electromagnetism Questions & Answers Alternating Current - ANSWER: The electric current produced by the generator changes direction each time the coil makes a half turn. Because the electric current changes direction, it is an alternating current. Generators in power plants also make alternating current. Applications of Electromagnetism - ANSWER: door bell armature - ANSWER: a loop or coil of wire that can rotate. The armature is mounted between the poles of a permanent magnet or electromagnet. aurora - ANSWER: The beautiful curtain of light is called an aurora. Earth's magnetic field plays a part in making auroras. An aurora is formed when charged particles from the sun hit oxygen and nitrogen atoms in the air. The atoms become excited and then give off light of many colors. can a magnet cause a current-carrying wire to move? - ANSWER: yes. This property is useful in electric motors. Cause of Magnetism - ANSWER: Whether a material is magnetic depends on the material's atoms.In most materials, such as copper and aluminum, the magnetic fields of the individual atoms cancel each other out. Therefore, these materials are not magnetic.But in materials such as iron, nickel, and cobalt, groups of atoms are in tiny areas called domains. The north and south poles of the atoms in a domain line up and make a strong magnetic field. Domains are like tiny magnets of different sizes within an object. The arrangement of domains in an object determines whether the object is magnetic...