Question

How to use Fleming's left-hand rule?

Answer 1

Fleming's Left-Hand Rule is used to find the direction of the force exerted on a current-carrying conductor placed in a magnetic field. It's mainly applied in motors to understand how the force works in the context of electric motors.

Steps to Use Fleming’s Left-Hand Rule:

1. Position Your Left Hand:
   

   - Stretch out your left hand so that your thumb, index finger, and middle finger are all at right angles (90°) to each other.

1. Understand What Each Finger Represents:
   

   - Index Finger (First Finger): This represents the magnetic field (from North to South).
   - Middle Finger (Second Finger): This represents the current (from positive to negative).
   - Thumb: This represents the motion or force (direction of the force on the conductor).

1. Align with the Situation:
   

   - Point your index finger in the direction of the magnetic field (from North to South).
   - Point your middle finger in the direction of the current (from positive to negative).
   - Your thumb will then point in the direction of the force or the motion of the conductor.

Example:

1. Imagine you have a current flowing through a wire that is placed in a magnetic field.
   

1. If the magnetic field is going from left to right (you point your index finger that way) and the current is flowing upward (you point your middle finger upward), then your thumb will point out of the page. This means the force on the wire is pushing it out of the page.
   

Why is it Useful?

This rule helps you quickly determine the direction of motion in devices like electric motors, where current flows through wires in magnetic fields, creating a force that makes parts of the motor move.

Let me know if you'd like more clarification or examples!