To show that force acting on a current carrying conductor placed in a magnetic field increases with the field strength. Apparatus
Required : Aluminium rod, stand horse shoe magnet of different intensity, cell, key and connecting wires.
Procedure : (i) Arrange the set-up as shown in figure.
A current carrying rod, PQ is experiencing force F
(ii) Plug the key, the current flowing through the rod from Q to P observe the displacement of rod.
(iii) Now unplug the key and remove the first horse shoe magnet and place the second horse shoe magnet of higher magnetic field strength in a similar manner to that of first.
(iv) Plug the key, the current again flow through the rod from Q to P. Again observe the deflection of rod.
(v) Now bring both’the magnet closer together (to ensure greater magnetic field than that of previous case). Again observe the motion of rod.
Observations : Each time, the conductor moves faster than that of previous one. It is possible only when conductor gets accelerated more each time which required more force. (F = ma) Thus, if the magnetic field strength is increased, the rod will experience a greater force and move faster.
Conclusion : The force acting on a current carrying conductor placed in a magnetic field increases with increase in field strength
