Experiments of Faraday and Henry

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Faraday and Henry Experiments

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What was Experiment 1 of Faraday and Henry?

In the first experiment of Faraday and Henry, a coil was connected to a galvanometer. Then a bar magnet was pushed towards the coil This was done in a way that the north pole was pointing towards the coil. It was noticed that as the bar magnet shifted, the galvanometer showcased deflection. The same thing was done with the south pole.


It was observed in this experiment of Faraday and Henry that the shift and deflection took place only when the magnet was in motion and not when it was stationary. The point of deflection is small or large depending on the speed at which the motion takes place.


The conclusion of the Faraday and Henry experiment was that there was relative motion between the coil and magnet resulting in the generation of current in the coil.


What was the Second Experiment of Faraday and Henry?

In this experiment, the bar magnet of the circuit was replaced with another coil that had current generated within it that was connected to a battery. The current coil which was connected to a battery produces a steady current. The second coil that was the primary coil shows deflection in the galvanometer pointer which indicates the presence of current in it.


Here, same as above, the degree to which the deflection took place depended on the motion of the secondary coil towards the primary coil. The magnitude also depends on the speed with which it was moved. This shows how the second case is analogous to the first.


However, the third experiment of Faraday and Henry showcases that the relative motion is not necessary to produce current. Both of the coils are steadily placed, one is connected to the battery and the other to a galvanometer. The button in the battery when pushed repeatedly does not pass current but when pushed once, the galvanometer deflects.

Hopefully, some concepts of the experiment by Faraday and Henry are clear.


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Solved Example

Q1: What was not included in experiment 1 of Faraday and Henry.

  1. Galvanometer

  2. Coils

  3. Funnel

  4. Battery

Ans: Funnel. There was no funnel in experiment 1 of Faraday and Henry.


Fun Fact

Faraday has done some praiseworthy work in his years of discoveries. Along with his fellow scientist, Faraday derived words such as electrodes, anodes and ions for his experiments and was considered as futuristic names.

FAQ (Frequently Asked Questions)

Q1. What was the Observation and Conclusion of the First Experiment of Faraday and Henry?

Ans: In the first experiment, it was observed that when the bar magnet was moved closer towards the coil when stationary with the north pole of the magnet facing the coil, there was a deflection in the galvanometer needle indicating the presence of current in the circuit.


The deflection was observed only during the time interval when the magnet was in motion. When the magnet was moved towards the coil and the south pole towards the coil, the deflection was observed in the opposite direction, indicating that the current developed was in the opposite direction to that induced by the north pole. The deflection was also observed when the magnet was stationary and larger deflection was observed when the motion of the magnet is increased. By this, Faraday also concluded that the effect that magnet gave in one way was the same as the effect when the magnet was moved the other way.

Q2: Note Down the Observation of the Second Experiment of Faraday.

Ans: The second experiment holds a lot of significance as well. When two coils carrying current are placed opposite to each other, it is observed that when any one of the coils is moved then there is deflection in the galvanometer. It is observed that when the secondary coil is moved towards the primary coil, it shows deflection in one direction and when moved away from the primary coil, the galvanometer shows deflection in the opposite direction. Analogous to the first experiment, in the second experiment also, the magnitude of deflection in the galvanometer changes according to the speed of movement of the secondary coil.