wo coils C1 and C2 are wrapped around a non conducting cylinder. Coil C1 is connected to a battery and key and C2 with galvanometer G. On pressing thekey (K), current starts flowing in the coil C1. State your observation in thegalvanometer :(i) When key K is pressed on.(ii) When current in the coil C1 is switched off.(iii) When the current is passed continuously through coil C1.(iv) Name and state the phenomenon responsible for the above observation.Write the name of the rule that is used to determine the direction of currentproduced in the phenomena.
Answers
i) when key is plugged in coil C₁. the galvanometer is connected to coil C₂ shows the deflection.
explanation :- when the key is plugged in the coil C₁, flow of the electric current increase in the coil C₁. due to increase in electric current, increase in magnetic field strength in the coil C₁. now, these magnetic lines of forces are pass through the coil C₂, due to this change in magnetic field in the coil C₂,induce the potential difference in such a way that coil C₂ opposes the increase in the magnetic field . this results, in a flow of current in the second coil , when current pass through the galvanometer it gives a deflection.
ii) when the current in the coil C₁ is switch off :- galvanometer shows the deflection but in opposite direction.
explanation:- when the key is plugged out in the coil C₁, flow of electric current decreases in the coil C₁. due to decrease in electric current decrease in magnetic field strength in it. now, these magnetic field lines of force pass through the coil C₂ , change in magnetic field strength in the coil C₂ induce the potential difference in such a way that the coil C₂ opposes the decrease the magnetic field strength, this results in a flow of current in the second coil.when current pass through the galvanometer it gives a deflection but in opposite direction.
iii) when current continues to flow in the coil C₁, there is no deflection seen in the galvanometer due to no change in magnetic lines of force.
iv) Electromagnetic induction is the production of an emf {electromotive force} across an electric conductor in a charging magnetic field. it is associated by changing of magnetic flux.
Answer:
(i) When key is pressed on, the galvanometer needle deflects momentarily in one direction. (ii) When the current in the coil C1 is switched off, the galvanometer needle deflects again momentarily but in opposite direction to that in the previous case. (iii) When current is passed continuously through coil C1, no deflection is observed in the galvanometer. (iv) The phenomenon responsible for the above observations is electromagnetic induction. Electromagnetic Induction: The process, by which a changing magnetic field in a conductor induces a current in another conductor placed nearby, is called electromagnetic induction. • Fleming’s right hand rule is used to determine the direction of current produced in the phenomena of electroynagnetic induction.
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