The Turning Effect of a Current-carrying Coil in a Magnetic Field

Question 1

How to determine direction of force?

Answer 1

Fleming’s Left Hand Rule

FMC

Question 2

Battery flows from which terminal to which?

Answer 2

positive to negative

Question 3

What is the function of commutator? The ()

Answer 3

Commutator is use to reverse current every half cycle

Question 4

Name the type of motor shown in:

Answer 4

Directs Current Motor

Question 5

Process 1 : when the loop is horizontal. What happens when current flows through the loop?

Answer 5

Upward and downward force produced

Question 6

Process 2 : When the loop is vertical. What happens?

Answer 6

No current is conducted in loop because carbon brush does not touch commutator.
Coil still rotate due to presence of inertia

Question 7

Current flows from which terminal to which terminal?

Answer 7

Positive to negative

Question 8

What can we use to determine direction of force?

Answer 8

Fleming’s Left Hand Rule

FMC

Question 9

Factors affecting the speed of Rotation of an Electric motor

Answer 9

• Number of turns of coil wire
• Magnitude of current
• Strength of magnetic field

Question 10

Advantages of brushed motor

Answer 10

• Long lasting, no maintenance required

- less friction

Question 11

What is the difference between Fleming’s Left Hand Rule and Fleming’s Right hand rule

in terms of

• causes
• effects
• for motor and generators

Answer 11

Fleming’s Left hand rule

• for motor
• causes : magnetic field and current
• effects: to determine the direction of force

Fleming’s Right hand rule

• for generator
• causes: Magnetic field and force
• effects: direction of induced current in generator