chapter 17

Question 1

scientists classify materials as either magnetically hard or magnetically soft.

Answer 1

Iron is a soft magnetic material: easily magnetized, and tends to lose its magnetic properties easily

Hard magnetic materials
cobalt, nickel. Hard to magnetize. don’t lose their magnetic properties easily.

Question 2

magnetic pole

Answer 2

one of two points such as the ends of a magnet that have opposition magneticc qualities.

Question 3

solenoid

Answer 3

a coil of wire with an electric current in it. Has a north and south pole, just like a magnet.

Question 4

electromagnet

Answer 4

a coil that has a soft iron core and that acts as a magnet when an electric current is in the coil. the iron core increases the strength of the magnetic field of the coil, which without the core is a solenoid

Question 5

galvanometer

Answer 5

an instrument that detects, measures and determines the direction of a small electric current

Question 6

electromagnetic induction

Answer 6

the process of creating a current in a circuit by changing a magnetic field

Question 7

transformer

Answer 7

magnetic field produced by a primary coil induces a current in a secondary coil. the voltage across the secondary coil is proportional to the number of turns it has relative to the number of turns in the primary coils