12.3 The Motor Effect

• What is the motor effect?

  Force on current-carrying conductor
• What happens to the motor force when the magnetic field strength increases?

  It increases
• What happens to the motor force when the angle between the conductor and the magnetic field is 90 degrees?

  It is maximum
• Steps involved in observing the motor effect

  1️⃣ Place a current-carrying conductor in a magnetic field

  2️⃣ Supply current to the conductor

  3️⃣ Observe the force on the conductor
• The motor force is maximum when the conductor is perpendicular to the magnetic field
• What happens to the motor force if the current in the conductor is reduced?

  It decreases
• What is the motor effect?

  Force on current-carrying conductor in magnetic field
• What are the three components required to observe the motor effect?

  Current-carrying conductor, magnetic field, power supply
• Match the component with its function in the motor effect:

  Current-carrying Conductor ↔️ Carries electric current

  Magnetic Field ↔️ Provides magnetic force

  External Power Supply ↔️ Supplies electric current
• The motor effect is the underlying principle behind electric motors.


  True
• The maximum motor force occurs when the conductor is parallel to the magnetic field.

  False
• Match the component of the motor effect with its function:

  Current-carrying Conductor ↔️ Interacts with magnetic field

  Magnetic Field ↔️ Provides magnetic force

  External Power Supply ↔️ Supplies electric current
• What is the motor effect caused by?

  Interaction between magnetic fields
• Electric motors convert electrical energy into mechanical energy using the motor effect.

  True
• What happens to the motor force when the strength of the magnetic field increases?

  Motor force increases
• The maximum motor force occurs when the conductor is perpendicular to the magnetic field.
• The motor effect is used in electric motors to convert electrical energy into mechanical work.


  True
• The interaction between the current and the magnetic field generates a force on the conductor.
• The strength of the motor force depends on the magnetic field strength, the current strength, and the angle between the conductor and the field.
• Steps to apply Fleming's Left-Hand Rule:

  1️⃣ Hold your left hand out with your thumb, forefinger, and middle finger all perpendicular to each other.

  2️⃣ Point your thumb in the direction of the magnetic field.

  3️⃣ Point your forefinger in the direction of the current.

  4️⃣ Your middle finger will point in the direction of the motor force.
• Match the motor component with its function:

  Coil of Wire ↔️ Carries current and experiences force

  Permanent Magnet ↔️ Creates magnetic field

  Commutator ↔️ Reverses current direction

  Brushes ↔️ Make electrical contact
• Electric generators use the motor effect to produce electricity by moving a conductor through a magnetic field.

  True
• The motor effect is the force experienced by a current-carrying conductor when placed in a magnetic field
• The motor effect converts electrical energy into mechanical work
• The motor effect is the primary mechanism in electric motors.


  True
• The motor effect is maximized when the angle between the conductor and the magnetic field is 90 degrees.
• The motor force increases when the current in the conductor increases.


  True
• A stronger magnetic field results in a greater force on the conductor.
• The current-carrying conductor in the motor effect interacts with the magnetic field to experience a force.


  True
• What happens when a current-carrying conductor is placed in a magnetic field?

  Experiences a force
• What is the purpose of Fleming's Left-Hand Rule?

  Determine motor force direction
• Fleming's Left-Hand Rule helps visualize the interaction between magnetic fields and electric currents.

  True
• In electric fans, the motor effect causes the coil to rotate, turning the fan blades.
• A stronger magnetic field results in a greater motor force.


  True
• In Fleming's Left-Hand Rule, the middle finger points in the direction of the motor force.
• What reverses the current's direction in an electric motor to maintain continuous rotation?

  Commutator and brushes