7.2.1 Fleming's Left-Hand Rule

• What does the motor effect describe?

  Force on current-carrying conductor
• The force in the motor effect is parallel to both the current and the magnetic field.

  False
• The magnitude of the force in the motor effect is calculated using the formula F = BIL
• What is a current-carrying conductor in the motor effect?

  A wire carrying electric current
• Match the finger in Fleming's Left-Hand Rule with what it represents:

  Thumb ↔️ Force

  First Finger ↔️ Magnetic Field

  Second Finger ↔️ Current
• Fleming's Left-Hand Rule uses the right hand to determine force direction.

  False
• Steps to apply Fleming's Left-Hand Rule

  1️⃣ Hold your left hand with thumb, first finger, and second finger at right angles

  2️⃣ Point your first finger in the direction of the magnetic field

  3️⃣ Point your second finger in the direction of the current

  4️⃣ Your thumb will point in the direction of the force
• In Fleming's Left-Hand Rule, the first finger points in the direction of the magnetic field
• What does the thumb represent in Fleming's Left-Hand Rule?

  Force direction
• The magnetic field in Fleming's Left-Hand Rule is directed from North to South.
• What are the finger associations in Fleming's Left-Hand Rule?

  Force, field, current
• The magnitude of the force experienced by a current-carrying conductor in a magnetic field is calculated using the formula F = BIL
• The force experienced by a current-carrying conductor in a magnetic field is perpendicular to both the current and the field
• Match the key aspects of the motor effect with their descriptions:

  Current-carrying conductor ↔️ A wire carrying an electric current

  Magnetic field ↔️ A region where magnetic forces act

  Force ↔️ The force experienced by the conductor
• What is Fleming's Left-Hand Rule used to determine?

  Force direction
• Steps to apply Fleming's Left-Hand Rule

  1️⃣ Hold your left hand with thumb, first finger, and second finger at right angles

  2️⃣ Point first finger in direction of magnetic field

  3️⃣ Point second finger in direction of current

  4️⃣ Your thumb will point in direction of force
• Fleming's Left-Hand Rule aligns with the principle of the motor effect
• Electric motors convert electrical energy into mechanical energy using the motor effect.
• What device measures small currents using the motor effect?

  Galvanometer
• In electric motors, the force on the rotor coils causes it to spin
• A conductor of length $0.5 m$ carrying a current $2 A$ in a magnetic field $0.8 T$ experiences a force of 0.8 N
• What current is needed for a $0.3 m$ wire in a0.6 T</latex> magnetic field to experience a $1.2 N$ force?


  6.67 A
• A wire carrying $4 A$ in a $0.5 T$ field experiences a $2 N$ force. The wire's length is $1 m$