7.2.1 Fleming's Left-Hand Rule

• The motor effect is the force experienced by a current-carrying conductor when placed in a magnetic field.
• What is the motor effect?

  Force on current in magnetic field
• In Fleming's left-hand rule, the middle finger points in the direction of the magnetic field.

  False
• According to Fleming's left-hand rule, the forefinger points in the direction of the magnetic field.
• The motor effect occurs when a current-carrying conductor is placed in a magnetic field.


  True
• In Fleming's left-hand rule, the middle finger indicates the direction of the electric current in the conductor.
• In the example given, what direction does the force point when the current is downwards and the magnetic field is from left to right?

  Out of the page
• What is the purpose of Fleming's left-hand rule?

  Determine force direction
• The middle finger in Fleming's left-hand rule indicates the direction of the electric current
• What does the forefinger represent in Fleming's left-hand rule?

  Magnetic field
• What is the motor effect caused by?

  Current-carrying conductor in a magnetic field
• In Fleming's left-hand rule, aligning the forefinger with the current is correct.

  False
• The thumb in Fleming's left-hand rule represents the direction of the conductor's motion
• What is the first step in applying Fleming's left-hand rule?

  Hold fingers perpendicularly
• In Fleming's left-hand rule, the thumb points in the direction of motion
• What does the thumb in Fleming's left-hand rule represent?

  Force or motion
• If a conductor carries a current downwards through a magnetic field from left to right, the thumb points out of the page
• What is the role of the thumb in Fleming's left-hand rule?

  Direction of motion
• The directions of the magnetic field, current, and force in Fleming's left-hand rule are always perpendicular to each other.

  True
• What type of conductor is required for Fleming's left-hand rule to apply?

  Current-carrying conductor
• The forefinger in Fleming's left-hand rule represents the direction of the magnetic field lines.

  True
• In Example 1, the conductor carries a current of 5A downwards through a magnetic field from left to right
• In Example 2, what direction does the middle finger point if the current is to the right and the magnetic field is upwards?

  To the right
• What does the thumb represent in Fleming's left-hand rule?

  Direction of motion
• Match the finger with what it represents in Fleming's left-hand rule:

  Thumb ↔️ Force/Motion

  Forefinger ↔️ Magnetic Field

  Middle Finger ↔️ Current
• What is the relationship between the current, magnetic field, and force in the motor effect?

  Perpendicular to each other
• Steps to determine the direction of force using Fleming's left-hand rule:

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

  2️⃣ Align your forefinger with the magnetic field direction

  3️⃣ Align your middle finger with the current direction

  4️⃣ Your thumb will point in the direction of the force
• The force on a current-carrying conductor in a magnetic field is perpendicular to both the current and the magnetic field.


  True
• To apply Fleming's left-hand rule, the thumb, forefinger, and middle finger must be perpendicular to each other.
• In Fleming's left-hand rule, the thumb, forefinger, and middle finger must be perpendicular to each other.


  True
• Steps to apply Fleming's left-hand rule in an example

  1️⃣ Align forefinger with magnetic field

  2️⃣ Align middle finger with current

  3️⃣ Thumb points to force direction
• The magnetic field lines in Fleming's left-hand rule go from North to South
• What does the middle finger in Fleming's left-hand rule indicate?

  Direction of current
• The forefinger in Fleming's left-hand rule indicates the direction of the magnetic field lines from North to South.

  True
• Match the finger with its corresponding direction in Fleming's left-hand rule:

  Thumb ↔️ Motion

  Forefinger ↔️ Magnetic Field

  Middle Finger ↔️ Current
• The middle finger in Fleming's left-hand rule represents the direction of the current.


  True
• Steps to use Fleming's left-hand rule to find the direction of force

  1️⃣ Hold fingers perpendicularly

  2️⃣ Align forefinger with magnetic field

  3️⃣ Align middle finger with current

  4️⃣ Thumb points to force direction
• In Fleming's left-hand rule, the thumb indicates the direction of the force experienced by the conductor.

  True
• What does the middle finger represent in Fleming's left-hand rule?

  Electric current
• Fleming's left-hand rule is used to determine the direction of the force