Electromagnetism Physics Form 5

What is represented by the fore finger, middle finger and thumb when Fleming's left-hand rule is used?

• Fore finger: Direction of current

  Middle finger: Direction of force

  Thumb: Direction of magnetic field

• Fore finger: Direction of magnetic field,

  Middle finger: Direction of current

  Thumb: Direction of force

• Fore finger: Direction of force

  Middlefinger: Direction of magneticfield

  Thumb: Direction of current

• Fore finger: Direction of current

  Middle finger: Direction of magnetic field

  Thumb: Direction of force

• 
• 
• 
• 

• WX: Downward

  YZ: Upward

• WX: Downward

  YZ: Downward

• WX: Upward

  YZ: Upward

• WX: Upward

  YZ: Downward

• Solenoid: stationary

  Bar magnet: stationary

• Solenoid: moves to the left at a speed of 4m/s

  Bar magnet: moves to the left at a speed of 4m/s

• Solenoid: moves to the right at a speed of 4m/s

  Bar magnet: moves to the right at a speed of 4m/s

• Solenoid: moves to the right at a speed of 4m/s

  Bar magnet: moves to the left at a speed of 4m/s

• Direction 1

• Direction 2

• Direction 3

• Direction 4

The magnitude of the induced current produced in a direct current generator can be increased by

• decreasing the number of turns of the coil

• increasing the distance between the poles of the permanent magnet

• decreasing the diameter of the commutator

• increasing the speed of rotation

• 45%

• 50%

• 90%

• 95%

The function of transformers in the transmission and distribution of electrical energy is to

• increase the power

• reduce the resistance

• change the voltage

• reduce the transmission time