Question

Draw the pattern of magnetic field lines produced around a current-carrying straight conductor passing perpendicularly through cardboard. Name, state and apply the rule to mark the direction of these field lines.

Answer 1

Magnetic field lines around a current-carrying conductor:

1. The direction of magnetic field lines will be shown using the right-hand thumb rule. The magnetic field lines will be directed by the fingers wrapped around the current-carrying conductor if the conductor is held in the right hand with the thumb pointing in the direction of the current.
   
2. The diagram of the pattern of field lines is as follows,
   
3. The strength of the magnetic field is inversely proportional to the distance from the origin, the strength of the magnetic field will decrease as the place where the magnetic field is to be calculated is moved away from the straight conductor.