Observations made by faradey and Henry electromagnetic induction of class 10 ncert
Answers
Figure below shows a closed circuit containing coil of insulated wire.
Also note that circuit does not contain any source of emf so there is no deflection in the galvanometer
Faraday's experiment of bar magnet to generate current in the coil
If we move bar magnet towards the coil keeping the coil stationary with north pole of the magnet facing the coil (say) then we notice deflection in needle of the galvanometer indicating the pressence of the current in the circuit
This deflection observed is only for the time interval during which the magnet is in motion
Now if we begin to move the magnet in the opposite direction then 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 opposite direction,again indicating that the current now setup in the coil is in reverse direction to that when the north pole faces the wire
A deflection is also oberved in galvanometer when the magnet is held stationary and circuit is moved away from the magnet.
It is further observed that faster is the motion of magnet ,larger is the deflection in the galavanometer needle.
From this experiment faraday convinced that magnet moving towards the coil one way has the same effect moving coil towards the magnet the other way.
(ii) experiment -2
Figure-2 given below shows a primary coil P connected to the battery and a secondary coild connected to the galvanometer
Faraday's experiment of variable primary coil current to generate current in the secondary coil
Now we have replaced magnet of the previous experiment with a current carrying coil and expect to observe similar effect as current carrying coil produces magnetic field.
The motion of either of the coils shows deflection in the galvanometer.
Also galvanemter shows a sudden deflection in one direction when current was started in primary coil and in the opposite direction when the current was stopped.
Notes
Faraday's experiment
Magnetic Flux
Faradays law of electromagnetic induction
Direction of Induced EMF: Lenz's Law
Motional EMF
Induced Electric Fields
Assignments
Electromagnetic Induction MCQ.
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