Magnetic Fields

Question 1

What hand can you use to find the direction of the force acting on a current carrying wire at a right angle to a magnetic field?

Answer 1

The left hand

Question 2

Describe what each finger represents on Fleming’s left hand rule

Answer 2

The first finger represents the direction of the magnetic field. The second finger represents the direction of the current. The thumb represents the direction of the motion or force

Question 3

Give the condition needed to use the equation F=BIL to calculate them force on a current carrying wire in a magnetic field.

Answer 3

The current carrying wire must be perpendicular to the magnetic field

Question 4

What does B represent in F=BIL, and what are the units

Answer 4

B is the magnetic flux density, measured in teslas (T)

Question 5

Define in words the magnetic flux density B

Answer 5

The force on one metre of wire carrying a current of one amp at right angle to the magnetic field

Question 6

Define a Tesla.

Answer 6

1 Tesla = 1 x N/Am

Question 7

Describe the process of investigating the force on current carrying wire

Answer 7

….

Question 8

Why does a current carrying charge experiences a force in a magnetic field?

Answer 8

a force acts on a charged particle moving in a magnetic field

Question 9

How to calculate the force acting on a charged particle whose velocity is perpendicular to a uniform magnetic field

Answer 9

Use the equation F = BQv

Question 10

How to work out the direction a force will act on negative and positive charges particles

Answer 10

Use your second finger as the direction of motion of a positive charged particle. If the charge is negative point your second finger opposite the direction of motion