Question

Describe the activity that shows that a current-carrying conductor experiences a force perpendicular to its length and the external magnetic field. How does Fleming’s left-hand rule help us to find the direction of the force acting on the current-carrying conductor?

Answer 1

Activity for a current-carrying conductor:

1. Take a little aluminium rod and write AB on it of about $5$ centimeter.
2. Suspend it horizontally from a stand using two connecting cables.
3. Place a powerful horseshoe magnet between the two poles with the magnetic field pointing upwards.
4. Place the north pole of the magnet vertically below the aluminium rod and the south pole vertically above it for this.
5. Connect the aluminium rod to a battery, a key, and a rheostat in series.
6. Now, from end B to end A, run a current through the aluminium rod.
7. It is observed that the rod is displaced towards the left.
8. Reverse the direction of the stream flowing through the rod to see which way it is displaced. It's moving right now.
   

Fleming Left-hand rule:

1. When an electric current flows through a straight wire and an external magnetic field is put across it, the wire experiences a force that is perpendicular to both the field and the direction of the current flow, according to Fleming's left-hand rule.
2. The direction of the force, magnetic field, and current may all be determined using this rule.
3. The thumb, first finger, and second finger of the left hand can all be held perpendicular to each other. The direction of motion arising from the force on the conductor is represented by the thumb. The first finger represents the magnetic field's direction. The current's direction is represented by the second finger.