Magnetic Fields

Question 1

What is a magnetic field?

Answer 1

A magnet field is a region in which a magnet pole will experience a non-contact force

Question 2

I’m which direction do magnetic field line point?

Answer 2

From north to south

Question 3

What is magnetic flux density?

Answer 3

Magnetic flux density is a measure of the strength of a magnetic field. It can be viewed as the number of magnetic field line that pass through a given area

Question 4

What three factors determine the force exerted on a charge moving through a magnetic field?

Answer 4

1) the magnetic flux density
2) the charge of the particle
3) the velocity of the particle perpendicular to the field

Question 5

State the equation used to calculate the force of certes in a charge moving through a magnetic field?

Answer 5

F=BqVsinx

Question 6

What is the relationship between the direction of a charge’s motion and the direction of the magnetic force jt experiences?

Answer 6

The force is always perpendicular to the charges motion

Question 7

Describe and explain the path taken by a charge in a magnetic field?

Answer 7

The charge will move in a circular path. This is because the magnetic force always acts perpendicular to the charge’s motion and so acts as a centripetal force

Question 8

What is produced by a current-carrying wire?

Answer 8

A magnetic field is produced in a concentric circles around a wire when a current passes through it

Question 9

What occurs when a current-carrying wire is placed in a magnetic field?

Answer 9

The wire will experience a force due the permanent magnetic field interacting with the wire’s magnetic field

Question 10

What three factors affect the force experiences by a current-carrying wire placed in a magnetic field?

Answer 10

1) the magnetic flux density of the field
2) the current passing through the wire
3) the length of the wire

Question 11

State the equation used to calculate the force experienced by a current-carrying wire placed in a magnetic field

Answer 11

F=BILsinx

Question 12

What is Flemings left-hand rule used for?

Answer 12

To determine the direction of the force experienced by a current-carrying wire or living charge in a magnetic field

Question 13

What does the thumb represent when using Flemings left hand rule?

Answer 13

The thumb represents the direction of the force

Question 14

What for the first finger represent when using Flemings left-hand rule?

Answer 14

The direction of the field

Question 15

What does the second finger represent when using Fleming’s left-hand rule for a moving charge?

Answer 15

The direction that a positive charge would move. This means that of it is a negative charge, you just point your second finger on the opposite direction to its motion

Question 16

What does the finger represent when using Fleming’s left-hand rule for a current-carrying wire?

Answer 16

The direction of conventional current flow