Electromagnetic Induction
3.0 Experiments by Faraday and Henry
3.0 Experiments by Faraday and Henry
In figure $2$, when bar magnet is moved in the axis of conducting loop. There is a deflection in the galvanometer reading. That shows there is a current in the loop. When magnet is not moving there is no deflection in galvanometer reading that means there is no current in loop. Current in conducting loop flows in different directions when magnet is moved toward and backward. He also saw the deflection in galvanometer when he moved conducting loop in different directions. After study of this behaviour in details He came up with following law:
"When the magnetic flux through a closed conducting loop changes, an electromotive force is induced in the loop and that is given by the rate of change of magnetic flux through the loop."
$$\varepsilon = - \frac{{d{\Phi _m}}}{{dt}}$$
