Force on a current carrying conductor in a magnetic field

As performed in the real lab:


A horse shoe magnet, a small aluminium rod, an ammeter, two wooden stands, two connecting wires, a battery, a plug key.


  1. Suspend the aluminium rod horizontally from the stand using clean connecting wires.
  2. Place the horse-shoe magnet in such a way that the rod lies in between both the poles such that south pole is vertically above and north pole is vertically below the rod.
  3. Connect the rod in series to the battery, key and the rheostat.
  4. Now switch on the current and observe the displacement of the rod.
  5. Reverse the direction of the current and observe the change in the displacement of the rod. 

As performed in the simulator:

  1. Click on "Switch" to start/stop the flow of current through the circuit.
  2. Observe and note the change in the position of the aluminum rod as the current flows through the circuit.
  3. To reverse the direction of the current switch off the circuit, then click on the wire.
  4. Repeat the procedure.

Observation & Inference:


On passing current through a straight conductor (aluminium rod) kept in a magnetic field, the conductor gets displaced upward or downward.


  1. The direction of displacement of the conductor rod changes with the change in the direction of current through it.
  2. The displacement of aluminium rod is in accordance with Fleming’s left-hand rule.