Magnetism and Electromagnetism

Question 1

What do magnets do?

Answer 1

Attract and repel other magnetic materials

Question 2

What are the properties of a hard magnet?

Answer 2

A hard magnet will keep its magnetism permanently

Question 3

What are the properties of a soft magnet?

Answer 3

It loses its induced magnetism quickly

Question 5

How do you use magnets to produce a magnetic field?

Answer 5

Placing the north and south poles of two permanent bar magnets near each other creates a uniform field between the two magnets

Question 6

What does an electric current in a conductor produce?

Answer 6

A magnetic field around it

Question 7

How do you make an electromagnet?

Answer 7

Wrapping a wire around an iron nail and running current through the wire

Question 8

How do you increase voltage in an induced magnet?

Answer 8

1) Increase the strength of the magnet
2) Increase the number of turns on the coil
3) Increases the speed of movement

Question 9

What does a transformer do?

Answer 9

Changes the size of an alternating voltage by having different number of turns on the input and output sides

Question 10

What do step-up transformers do?

Answer 10

Increase the voltage as they have more turns on the secondary col than the primary coil

Question 11

What do step-down transformers do?

Answer 11

Decrease the voltage as they have more turns on the primary coil than the secondary coil

Question 12

Input voltage/ output voltage equals

Answer 12

number of turns on primary coil/ number of turns on secondary coil