Question

Name and state the rule to determine the direction of a:
(i) magnetic field produced around a current carrying straight conductor.
(ii) force experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it.

Answer 1

Part (i): Magnetic Field Produced Around a Current Carrying Straight Conductor:
The rule to determine the direction of the magnetic field produced around a current-carrying straight conductor is known as the Right-Hand Rule. According to this rule:
- Point the thumb of your right hand in the direction of the current flowing through the conductor.
- The curled fingers of your right hand will show the direction of the magnetic field lines around the conductor.
This means that the magnetic field forms concentric circles around the wire with the current as the center. 
Part (ii): Force Experienced by a Current Carrying Straight Conductor in a Magnetic Field:
The rule to determine the direction of the force experienced by a current-carrying straight conductor placed in a magnetic field is known as the Fleming's Left-Hand Rule. 
According to this rule:
- Stretch the thumb, forefinger, and middle finger of your left hand at right angles to each other.
- Point your forefinger in the direction of the magnetic field (B), and your middle finger in the direction of the current (I).
- Your thumb will then point in the direction of the force (F) experienced by the conductor.
This rule helps to determine the force acting on the conductor when it is placed in a magnetic field.