1Magnetic properties of a substance Answers for Formative assessment

ANSWERS TO USES OF NEODYMIUM MAGNETS QUESTIONS

1.    a magnet is an object that is made of materials that create a magnetic field. Magnets have poles, at least one north pole and one south pole.

2.   Magnets are attracted to three types of metals: nickel, iron, and cobalt.

3.   Magnets are commonly made from materials that contain nickel, iron, or cobalt. When these materials are exposed to an external magnetic field, the structure of the material is changed on a microscopic level. The molecules are rearranged into lines and the process is called polarization. When enough of the material is polarized, it becomes a magnet.

4.   Permanent magnets produce a magnetic field without the need for any external source of power. An electromagnet generates a magnetic field only when an electrical current runs through it.

5.   Robotics and factory automation

Green energy

Door sensors

6.   A seismograph is the equipment used to measure the earthquakes tremors from the crust.

7.   Higher remanence

Higher coercivity

Higher energy product

Lower curie temperature