Magnetic fields

Question 1

What is a magnetic field?>

Answer 1

• region where a force is exerted on magnetic materials

Question 2

What are flux lines? What are they used for?

Answer 2

• magnetic fields can be re[resented by field lines
• also called flux lines

Question 3

Which direction do field lines gop?

Answer 3

north to south

Question 4

What does the closeness of the lines represent?

Answer 4

• closer the lines, the stronger the field

Question 5

How is a magnetic field induced around a wire?

Answer 5

• when current flows in a wire or any other long straight conductor, a magnetic field is induced around the wire

Question 6

What do the magnetic field lines look around the wire?

Answer 6

cocentric circles

Question 7

How is the dfirection of a magnetic field around a current-carrying wire worked out?

Answer 7

• using the right hand rule

Question 8

What happens to the field if you loop the wire into a coil (solendoid)

Answer 8

• doughnut shaped field
• forms a field like a bar magent