Question

write an experiment to prove electro magnetic induction​

Answer 1

Electromagnetic Induction Experiment?

Electromagnetic induction is the mechanism by which a current can be caused to flow due to a magnetic field transition.

Michael Faraday Experiment

Faraday first discovered in 1831 that whenever the number of magnetic lines of forces in the circuit changes, the emf is produced in the circuit and is known as induced emf, a phenomenon known as electromagnetic induction.

If the circuit is closed, the current flows through it, which is known as the induced current.

This induced emf and current lasts only for a time while the magnetic flux changes.

Two examples of the kind that Faraday and Henry have done

(i) Experiment - 1

The following figure shows a closed circuit containing an insulated wire coil.

Also note that the circuit contains no source of emf, so there is no deflection in the galvanometer

If we move the bar magnet towards the coil keeping the coil stationary with the north pole of the magnet facing the coil (say) then we notice a deflection in the needle of the galvanometer indicating the pressure of the current in the circuit.

This deflection is observed only for the interval of time during which the magnet is in motion. Now, if we start pushing the magnet in the opposite direction, the galvanometer needle is now deflected in the opposite direction.

Again, if we move the magnet towards the coil, with its south pole facing the coil, the deflection is now in the opposite direction, again indicating that the current now set in the coil is in the opposite direction to that when the north pole faces the wire.

Deflection is also observed in the galvanometer when the magnet is stationary and the circuit is moved away from the magnet.

It is also found that the motion of the magnet is higher, the deflection in the galvanometer needle is greater.

From this experiment, Faraday assumed that the magnet moving in one direction towards the coil had the same effect pushing the coil in the other direction towards the magnet.

Experiment - 2

primary coil P connected to the battery and the secondary coil connected to the galvanometer.

Now we have replaced the magnet from the previous experiment with a current-carrying coil and expect to experience a similar effect as the current-carrying coil generates a magnetic field.

The motion of either of the coils shows the deflection of the galvanometer.

The galvanometer also shows a sudden deflection in one direction when the current started in the primary coil and in the opposite direction when the current stopped.

Hope it helped you

Answer 2

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Observe that the voltmeter linked to the coil only indicates the presence of a current when the magnet is actually in motion, and that its needle deflects in one direction when the magnet is moved into the coil and in the opposite direction when it is dragged out of the coil.

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