See Our New JEE Book on Amazon

Inducing Current Without a Magnet


Faraday's law of electromagnetic induction is generally demonstrated by movement of a magnet in the vicinity of a coil. This demonstration shows electromagnetic induction without using a magnet.


You need a galvanometer, battery, long nail, and enameled copper wire.

Take a long nail and wind two coils side by side over it, as shown in figure. The coils should have about 100~turns of thick enamelled copper wire. Connect one coil to a battery through a switch. This coil is called the first coil or the primary coil. Connect the other coil to a galvanometer or galvanoscope. This coil is called the second coil or the secondary coil.

inducing current without a magnet

Turn on the switch while looking at the galvanometer. You will see that the needle of the galvanometer gets deflected and then immediately return to the zero mark, even while the switch is on. Now, turn off the switch. This time, the needle will get deflected in the opposite direction and then it will immediately return to the zero mark. The deflections in the galvanometer show that a current flows for a short while through the secondary.


  1. Demos on Faraday's Laws
  2. Fun with naughty coil
  3. Demos on Lenz's Law and Eddy Current

Subscribe to our channel

JEE Physics Solved Problems in Mechanics